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Merged revisions 70439 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk ........ r70439 | mark.dickinson | 2009-03-17 23:03:46 +0000 (Tue, 17 Mar 2009) | 3 lines Issue #2110: Add support for thousands separator and 'n' format specifier to Decimal __format__ method. ........
This commit is contained in:
Mark Dickinson
parent
9c59fe0714
commit
79f52039fe
283
Lib/decimal.py
283
Lib/decimal.py
@ -3587,18 +3587,16 @@ class Decimal(object):
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return self # My components are also immutable
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return self.__class__(str(self))
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# PEP 3101 support. See also _parse_format_specifier and _format_align
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def __format__(self, specifier, context=None):
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# PEP 3101 support. the _localeconv keyword argument should be
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# considered private: it's provided for ease of testing only.
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def __format__(self, specifier, context=None, _localeconv=None):
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"""Format a Decimal instance according to the given specifier.
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The specifier should be a standard format specifier, with the
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form described in PEP 3101. Formatting types 'e', 'E', 'f',
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'F', 'g', 'G', and '%' are supported. If the formatting type
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is omitted it defaults to 'g' or 'G', depending on the value
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of context.capitals.
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At this time the 'n' format specifier type (which is supposed
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to use the current locale) is not supported.
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'F', 'g', 'G', 'n' and '%' are supported. If the formatting
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type is omitted it defaults to 'g' or 'G', depending on the
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value of context.capitals.
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"""
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# Note: PEP 3101 says that if the type is not present then
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@ -3609,17 +3607,20 @@ class Decimal(object):
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if context is None:
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context = getcontext()
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spec = _parse_format_specifier(specifier)
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spec = _parse_format_specifier(specifier, _localeconv=_localeconv)
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# special values don't care about the type or precision...
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# special values don't care about the type or precision
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if self._is_special:
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return _format_align(str(self), spec)
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sign = _format_sign(self._sign, spec)
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body = str(self.copy_abs())
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return _format_align(sign, body, spec)
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# a type of None defaults to 'g' or 'G', depending on context
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# if type is '%', adjust exponent of self accordingly
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if spec['type'] is None:
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spec['type'] = ['g', 'G'][context.capitals]
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elif spec['type'] == '%':
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# if type is '%', adjust exponent of self accordingly
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if spec['type'] == '%':
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self = _dec_from_triple(self._sign, self._int, self._exp+2)
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# round if necessary, taking rounding mode from the context
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@ -3628,53 +3629,45 @@ class Decimal(object):
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if precision is not None:
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if spec['type'] in 'eE':
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self = self._round(precision+1, rounding)
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elif spec['type'] in 'gG':
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if len(self._int) > precision:
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self = self._round(precision, rounding)
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elif spec['type'] in 'fF%':
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self = self._rescale(-precision, rounding)
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elif spec['type'] in 'gG' and len(self._int) > precision:
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self = self._round(precision, rounding)
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# special case: zeros with a positive exponent can't be
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# represented in fixed point; rescale them to 0e0.
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elif not self and self._exp > 0 and spec['type'] in 'fF%':
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if not self and self._exp > 0 and spec['type'] in 'fF%':
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self = self._rescale(0, rounding)
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# figure out placement of the decimal point
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leftdigits = self._exp + len(self._int)
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if spec['type'] in 'fF%':
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dotplace = leftdigits
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elif spec['type'] in 'eE':
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if spec['type'] in 'eE':
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if not self and precision is not None:
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dotplace = 1 - precision
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else:
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dotplace = 1
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elif spec['type'] in 'fF%':
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dotplace = leftdigits
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elif spec['type'] in 'gG':
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if self._exp <= 0 and leftdigits > -6:
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dotplace = leftdigits
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else:
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dotplace = 1
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# figure out main part of numeric string...
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if dotplace <= 0:
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num = '0.' + '0'*(-dotplace) + self._int
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elif dotplace >= len(self._int):
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# make sure we're not padding a '0' with extra zeros on the right
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assert dotplace==len(self._int) or self._int != '0'
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num = self._int + '0'*(dotplace-len(self._int))
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# find digits before and after decimal point, and get exponent
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if dotplace < 0:
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intpart = '0'
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fracpart = '0'*(-dotplace) + self._int
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elif dotplace > len(self._int):
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intpart = self._int + '0'*(dotplace-len(self._int))
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fracpart = ''
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else:
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num = self._int[:dotplace] + '.' + self._int[dotplace:]
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# ...then the trailing exponent, or trailing '%'
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if leftdigits != dotplace or spec['type'] in 'eE':
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echar = {'E': 'E', 'e': 'e', 'G': 'E', 'g': 'e'}[spec['type']]
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num = num + "{0}{1:+}".format(echar, leftdigits-dotplace)
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elif spec['type'] == '%':
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num = num + '%'
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# add sign
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if self._sign == 1:
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num = '-' + num
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return _format_align(num, spec)
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intpart = self._int[:dotplace] or '0'
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fracpart = self._int[dotplace:]
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exp = leftdigits-dotplace
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# done with the decimal-specific stuff; hand over the rest
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# of the formatting to the _format_number function
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return _format_number(self._sign, intpart, fracpart, exp, spec)
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def _dec_from_triple(sign, coefficient, exponent, special=False):
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"""Create a decimal instance directly, without any validation,
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@ -5516,14 +5509,13 @@ _all_zeros = re.compile('0*$').match
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_exact_half = re.compile('50*$').match
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##### PEP3101 support functions ##############################################
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# The functions parse_format_specifier and format_align have little to do
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# with the Decimal class, and could potentially be reused for other pure
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# The functions in this section have little to do with the Decimal
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# class, and could potentially be reused or adapted for other pure
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# Python numeric classes that want to implement __format__
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#
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# A format specifier for Decimal looks like:
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#
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# [[fill]align][sign][0][minimumwidth][.precision][type]
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#
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# [[fill]align][sign][0][minimumwidth][,][.precision][type]
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_parse_format_specifier_regex = re.compile(r"""\A
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(?:
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@ -5533,14 +5525,23 @@ _parse_format_specifier_regex = re.compile(r"""\A
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(?P<sign>[-+ ])?
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(?P<zeropad>0)?
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(?P<minimumwidth>(?!0)\d+)?
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(?P<thousands_sep>,)?
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(?:\.(?P<precision>0|(?!0)\d+))?
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(?P<type>[eEfFgG%])?
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(?P<type>[eEfFgGn%])?
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\Z
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""", re.VERBOSE)
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del re
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def _parse_format_specifier(format_spec):
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# The locale module is only needed for the 'n' format specifier. The
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# rest of the PEP 3101 code functions quite happily without it, so we
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# don't care too much if locale isn't present.
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try:
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import locale as _locale
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except ImportError:
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pass
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def _parse_format_specifier(format_spec, _localeconv=None):
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"""Parse and validate a format specifier.
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Turns a standard numeric format specifier into a dict, with the
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@ -5550,9 +5551,13 @@ def _parse_format_specifier(format_spec):
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align: alignment type, either '<', '>', '=' or '^'
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sign: either '+', '-' or ' '
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minimumwidth: nonnegative integer giving minimum width
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zeropad: boolean, indicating whether to pad with zeros
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thousands_sep: string to use as thousands separator, or ''
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grouping: grouping for thousands separators, in format
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used by localeconv
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decimal_point: string to use for decimal point
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precision: nonnegative integer giving precision, or None
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type: one of the characters 'eEfFgG%', or None
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unicode: either True or False (always True for Python 3.x)
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"""
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m = _parse_format_specifier_regex.match(format_spec)
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@ -5562,26 +5567,25 @@ def _parse_format_specifier(format_spec):
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# get the dictionary
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format_dict = m.groupdict()
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# defaults for fill and alignment
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# zeropad; defaults for fill and alignment. If zero padding
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# is requested, the fill and align fields should be absent.
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fill = format_dict['fill']
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align = format_dict['align']
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if format_dict.pop('zeropad') is not None:
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# in the face of conflict, refuse the temptation to guess
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if fill is not None and fill != '0':
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format_dict['zeropad'] = (format_dict['zeropad'] is not None)
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if format_dict['zeropad']:
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if fill is not None:
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raise ValueError("Fill character conflicts with '0'"
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" in format specifier: " + format_spec)
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if align is not None and align != '=':
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if align is not None:
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raise ValueError("Alignment conflicts with '0' in "
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"format specifier: " + format_spec)
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fill = '0'
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align = '='
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format_dict['fill'] = fill or ' '
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format_dict['align'] = align or '<'
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# default sign handling: '-' for negative, '' for positive
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if format_dict['sign'] is None:
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format_dict['sign'] = '-'
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# turn minimumwidth and precision entries into integers.
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# minimumwidth defaults to 0; precision remains None if not given
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format_dict['minimumwidth'] = int(format_dict['minimumwidth'] or '0')
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if format_dict['precision'] is not None:
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@ -5593,54 +5597,163 @@ def _parse_format_specifier(format_spec):
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if format_dict['type'] in 'gG' or format_dict['type'] is None:
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format_dict['precision'] = 1
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# record whether return type should be str or unicode
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format_dict['unicode'] = True
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# determine thousands separator, grouping, and decimal separator, and
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# add appropriate entries to format_dict
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if format_dict['type'] == 'n':
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# apart from separators, 'n' behaves just like 'g'
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format_dict['type'] = 'g'
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if _localeconv is None:
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_localeconv = _locale.localeconv()
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if format_dict['thousands_sep'] is not None:
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raise ValueError("Explicit thousands separator conflicts with "
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"'n' type in format specifier: " + format_spec)
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format_dict['thousands_sep'] = _localeconv['thousands_sep']
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format_dict['grouping'] = _localeconv['grouping']
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format_dict['decimal_point'] = _localeconv['decimal_point']
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else:
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if format_dict['thousands_sep'] is None:
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format_dict['thousands_sep'] = ''
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format_dict['grouping'] = [3, 0]
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format_dict['decimal_point'] = '.'
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return format_dict
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def _format_align(body, spec_dict):
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"""Given an unpadded, non-aligned numeric string, add padding and
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aligment to conform with the given format specifier dictionary (as
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output from parse_format_specifier).
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It's assumed that if body is negative then it starts with '-'.
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Any leading sign ('-' or '+') is stripped from the body before
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applying the alignment and padding rules, and replaced in the
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appropriate position.
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def _format_align(sign, body, spec):
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"""Given an unpadded, non-aligned numeric string 'body' and sign
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string 'sign', add padding and aligment conforming to the given
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format specifier dictionary 'spec' (as produced by
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parse_format_specifier).
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"""
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# figure out the sign; we only examine the first character, so if
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# body has leading whitespace the results may be surprising.
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if len(body) > 0 and body[0] in '-+':
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sign = body[0]
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body = body[1:]
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else:
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sign = ''
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if sign != '-':
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if spec_dict['sign'] in ' +':
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sign = spec_dict['sign']
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else:
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sign = ''
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# how much extra space do we have to play with?
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minimumwidth = spec_dict['minimumwidth']
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fill = spec_dict['fill']
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padding = fill*(max(minimumwidth - (len(sign+body)), 0))
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minimumwidth = spec['minimumwidth']
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fill = spec['fill']
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padding = fill*(minimumwidth - len(sign) - len(body))
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align = spec_dict['align']
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align = spec['align']
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if align == '<':
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result = sign + body + padding
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elif align == '>':
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result = padding + sign + body
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elif align == '=':
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result = sign + padding + body
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else: #align == '^'
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elif align == '^':
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half = len(padding)//2
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result = padding[:half] + sign + body + padding[half:]
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else:
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raise ValueError('Unrecognised alignment field')
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return result
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def _group_lengths(grouping):
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"""Convert a localeconv-style grouping into a (possibly infinite)
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iterable of integers representing group lengths.
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"""
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# The result from localeconv()['grouping'], and the input to this
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# function, should be a list of integers in one of the
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# following three forms:
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#
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# (1) an empty list, or
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# (2) nonempty list of positive integers + [0]
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# (3) list of positive integers + [locale.CHAR_MAX], or
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from itertools import chain, repeat
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if not grouping:
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return []
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elif grouping[-1] == 0 and len(grouping) >= 2:
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return chain(grouping[:-1], repeat(grouping[-2]))
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elif grouping[-1] == _locale.CHAR_MAX:
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return grouping[:-1]
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else:
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raise ValueError('unrecognised format for grouping')
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def _insert_thousands_sep(digits, spec, min_width=1):
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"""Insert thousands separators into a digit string.
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spec is a dictionary whose keys should include 'thousands_sep' and
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'grouping'; typically it's the result of parsing the format
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specifier using _parse_format_specifier.
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The min_width keyword argument gives the minimum length of the
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result, which will be padded on the left with zeros if necessary.
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If necessary, the zero padding adds an extra '0' on the left to
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avoid a leading thousands separator. For example, inserting
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commas every three digits in '123456', with min_width=8, gives
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'0,123,456', even though that has length 9.
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"""
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sep = spec['thousands_sep']
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grouping = spec['grouping']
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groups = []
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for l in _group_lengths(grouping):
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if groups:
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min_width -= len(sep)
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if l <= 0:
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raise ValueError("group length should be positive")
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# max(..., 1) forces at least 1 digit to the left of a separator
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l = min(max(len(digits), min_width, 1), l)
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groups.append('0'*(l - len(digits)) + digits[-l:])
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digits = digits[:-l]
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min_width -= l
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if not digits and min_width <= 0:
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break
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else:
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l = max(len(digits), min_width, 1)
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groups.append('0'*(l - len(digits)) + digits[-l:])
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return sep.join(reversed(groups))
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def _format_sign(is_negative, spec):
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"""Determine sign character."""
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if is_negative:
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return '-'
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elif spec['sign'] in ' +':
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return spec['sign']
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else:
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return ''
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def _format_number(is_negative, intpart, fracpart, exp, spec):
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"""Format a number, given the following data:
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is_negative: true if the number is negative, else false
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intpart: string of digits that must appear before the decimal point
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fracpart: string of digits that must come after the point
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exp: exponent, as an integer
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spec: dictionary resulting from parsing the format specifier
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This function uses the information in spec to:
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insert separators (decimal separator and thousands separators)
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format the sign
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format the exponent
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add trailing '%' for the '%' type
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zero-pad if necessary
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fill and align if necessary
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"""
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sign = _format_sign(is_negative, spec)
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if fracpart:
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fracpart = spec['decimal_point'] + fracpart
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if exp != 0 or spec['type'] in 'eE':
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echar = {'E': 'E', 'e': 'e', 'G': 'E', 'g': 'e'}[spec['type']]
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fracpart += "{0}{1:+}".format(echar, exp)
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if spec['type'] == '%':
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fracpart += '%'
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if spec['zeropad']:
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min_width = spec['minimumwidth'] - len(fracpart) - len(sign)
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else:
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min_width = 0
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intpart = _insert_thousands_sep(intpart, spec, min_width)
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return _format_align(sign, intpart+fracpart, spec)
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##### Useful Constants (internal use only) ################################
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# Reusable defaults
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@ -605,6 +605,7 @@ class DecimalImplicitConstructionTest(unittest.TestCase):
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self.assertEqual(eval('Decimal(10)' + sym + 'E()'),
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'10' + rop + 'str')
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class DecimalFormatTest(unittest.TestCase):
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'''Unit tests for the format function.'''
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def test_formatting(self):
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@ -694,15 +695,110 @@ class DecimalFormatTest(unittest.TestCase):
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('', '1.00', '1.00'),
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# check alignment
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# test alignment and padding
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('<6', '123', '123 '),
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('>6', '123', ' 123'),
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('^6', '123', ' 123 '),
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('=+6', '123', '+ 123'),
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('#<10', 'NaN', 'NaN#######'),
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('#<10', '-4.3', '-4.3######'),
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('#<+10', '0.0130', '+0.0130###'),
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('#< 10', '0.0130', ' 0.0130###'),
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('@>10', '-Inf', '@-Infinity'),
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('#>5', '-Inf', '-Infinity'),
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('?^5', '123', '?123?'),
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('%^6', '123', '%123%%'),
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(' ^6', '-45.6', '-45.6 '),
|
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('/=10', '-45.6', '-/////45.6'),
|
||||
('/=+10', '45.6', '+/////45.6'),
|
||||
('/= 10', '45.6', ' /////45.6'),
|
||||
|
||||
# thousands separator
|
||||
(',', '1234567', '1,234,567'),
|
||||
(',', '123456', '123,456'),
|
||||
(',', '12345', '12,345'),
|
||||
(',', '1234', '1,234'),
|
||||
(',', '123', '123'),
|
||||
(',', '12', '12'),
|
||||
(',', '1', '1'),
|
||||
(',', '0', '0'),
|
||||
(',', '-1234567', '-1,234,567'),
|
||||
(',', '-123456', '-123,456'),
|
||||
('7,', '123456', '123,456'),
|
||||
('8,', '123456', '123,456 '),
|
||||
('08,', '123456', '0,123,456'), # special case: extra 0 needed
|
||||
('+08,', '123456', '+123,456'), # but not if there's a sign
|
||||
(' 08,', '123456', ' 123,456'),
|
||||
('08,', '-123456', '-123,456'),
|
||||
('+09,', '123456', '+0,123,456'),
|
||||
# ... with fractional part...
|
||||
('07,', '1234.56', '1,234.56'),
|
||||
('08,', '1234.56', '1,234.56'),
|
||||
('09,', '1234.56', '01,234.56'),
|
||||
('010,', '1234.56', '001,234.56'),
|
||||
('011,', '1234.56', '0,001,234.56'),
|
||||
('012,', '1234.56', '0,001,234.56'),
|
||||
('08,.1f', '1234.5', '01,234.5'),
|
||||
# no thousands separators in fraction part
|
||||
(',', '1.23456789', '1.23456789'),
|
||||
(',%', '123.456789', '12,345.6789%'),
|
||||
(',e', '123456', '1.23456e+5'),
|
||||
(',E', '123456', '1.23456E+5'),
|
||||
]
|
||||
for fmt, d, result in test_values:
|
||||
self.assertEqual(format(Decimal(d), fmt), result)
|
||||
|
||||
def test_n_format(self):
|
||||
try:
|
||||
from locale import CHAR_MAX
|
||||
except ImportError:
|
||||
return
|
||||
|
||||
# Set up some localeconv-like dictionaries
|
||||
en_US = {
|
||||
'decimal_point' : '.',
|
||||
'grouping' : [3, 3, 0],
|
||||
'thousands_sep': ','
|
||||
}
|
||||
|
||||
fr_FR = {
|
||||
'decimal_point' : ',',
|
||||
'grouping' : [CHAR_MAX],
|
||||
'thousands_sep' : ''
|
||||
}
|
||||
|
||||
ru_RU = {
|
||||
'decimal_point' : ',',
|
||||
'grouping' : [3, 3, 0],
|
||||
'thousands_sep' : ' '
|
||||
}
|
||||
|
||||
crazy = {
|
||||
'decimal_point' : '&',
|
||||
'grouping' : [1, 4, 2, CHAR_MAX],
|
||||
'thousands_sep' : '-'
|
||||
}
|
||||
|
||||
|
||||
def get_fmt(x, locale, fmt='n'):
|
||||
return Decimal.__format__(Decimal(x), fmt, _localeconv=locale)
|
||||
|
||||
self.assertEqual(get_fmt(Decimal('12.7'), en_US), '12.7')
|
||||
self.assertEqual(get_fmt(Decimal('12.7'), fr_FR), '12,7')
|
||||
self.assertEqual(get_fmt(Decimal('12.7'), ru_RU), '12,7')
|
||||
self.assertEqual(get_fmt(Decimal('12.7'), crazy), '1-2&7')
|
||||
|
||||
self.assertEqual(get_fmt(123456789, en_US), '123,456,789')
|
||||
self.assertEqual(get_fmt(123456789, fr_FR), '123456789')
|
||||
self.assertEqual(get_fmt(123456789, ru_RU), '123 456 789')
|
||||
self.assertEqual(get_fmt(1234567890123, crazy), '123456-78-9012-3')
|
||||
|
||||
self.assertEqual(get_fmt(123456789, en_US, '.6n'), '1.23457e+8')
|
||||
self.assertEqual(get_fmt(123456789, fr_FR, '.6n'), '1,23457e+8')
|
||||
self.assertEqual(get_fmt(123456789, ru_RU, '.6n'), '1,23457e+8')
|
||||
self.assertEqual(get_fmt(123456789, crazy, '.6n'), '1&23457e+8')
|
||||
|
||||
|
||||
class DecimalArithmeticOperatorsTest(unittest.TestCase):
|
||||
'''Unit tests for all arithmetic operators, binary and unary.'''
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user