mirror of
https://github.com/python/cpython.git
synced 2024-12-18 22:34:08 +08:00
43c0f1ac5e
Better account for single-line compound statements and semi-colon separated statements when suggesting Py3 replacements for Py2 print statements. Initial patch by Nitish Chandra.
220 lines
7.4 KiB
Python
220 lines
7.4 KiB
Python
import unittest
|
|
import sys
|
|
from io import StringIO
|
|
|
|
from test import support
|
|
|
|
NotDefined = object()
|
|
|
|
# A dispatch table all 8 combinations of providing
|
|
# sep, end, and file.
|
|
# I use this machinery so that I'm not just passing default
|
|
# values to print, I'm either passing or not passing in the
|
|
# arguments.
|
|
dispatch = {
|
|
(False, False, False):
|
|
lambda args, sep, end, file: print(*args),
|
|
(False, False, True):
|
|
lambda args, sep, end, file: print(file=file, *args),
|
|
(False, True, False):
|
|
lambda args, sep, end, file: print(end=end, *args),
|
|
(False, True, True):
|
|
lambda args, sep, end, file: print(end=end, file=file, *args),
|
|
(True, False, False):
|
|
lambda args, sep, end, file: print(sep=sep, *args),
|
|
(True, False, True):
|
|
lambda args, sep, end, file: print(sep=sep, file=file, *args),
|
|
(True, True, False):
|
|
lambda args, sep, end, file: print(sep=sep, end=end, *args),
|
|
(True, True, True):
|
|
lambda args, sep, end, file: print(sep=sep, end=end, file=file, *args),
|
|
}
|
|
|
|
|
|
# Class used to test __str__ and print
|
|
class ClassWith__str__:
|
|
def __init__(self, x):
|
|
self.x = x
|
|
|
|
def __str__(self):
|
|
return self.x
|
|
|
|
|
|
class TestPrint(unittest.TestCase):
|
|
"""Test correct operation of the print function."""
|
|
|
|
def check(self, expected, args,
|
|
sep=NotDefined, end=NotDefined, file=NotDefined):
|
|
# Capture sys.stdout in a StringIO. Call print with args,
|
|
# and with sep, end, and file, if they're defined. Result
|
|
# must match expected.
|
|
|
|
# Look up the actual function to call, based on if sep, end,
|
|
# and file are defined.
|
|
fn = dispatch[(sep is not NotDefined,
|
|
end is not NotDefined,
|
|
file is not NotDefined)]
|
|
|
|
with support.captured_stdout() as t:
|
|
fn(args, sep, end, file)
|
|
|
|
self.assertEqual(t.getvalue(), expected)
|
|
|
|
def test_print(self):
|
|
def x(expected, args, sep=NotDefined, end=NotDefined):
|
|
# Run the test 2 ways: not using file, and using
|
|
# file directed to a StringIO.
|
|
|
|
self.check(expected, args, sep=sep, end=end)
|
|
|
|
# When writing to a file, stdout is expected to be empty
|
|
o = StringIO()
|
|
self.check('', args, sep=sep, end=end, file=o)
|
|
|
|
# And o will contain the expected output
|
|
self.assertEqual(o.getvalue(), expected)
|
|
|
|
x('\n', ())
|
|
x('a\n', ('a',))
|
|
x('None\n', (None,))
|
|
x('1 2\n', (1, 2))
|
|
x('1 2\n', (1, ' ', 2))
|
|
x('1*2\n', (1, 2), sep='*')
|
|
x('1 s', (1, 's'), end='')
|
|
x('a\nb\n', ('a', 'b'), sep='\n')
|
|
x('1.01', (1.0, 1), sep='', end='')
|
|
x('1*a*1.3+', (1, 'a', 1.3), sep='*', end='+')
|
|
x('a\n\nb\n', ('a\n', 'b'), sep='\n')
|
|
x('\0+ +\0\n', ('\0', ' ', '\0'), sep='+')
|
|
|
|
x('a\n b\n', ('a\n', 'b'))
|
|
x('a\n b\n', ('a\n', 'b'), sep=None)
|
|
x('a\n b\n', ('a\n', 'b'), end=None)
|
|
x('a\n b\n', ('a\n', 'b'), sep=None, end=None)
|
|
|
|
x('*\n', (ClassWith__str__('*'),))
|
|
x('abc 1\n', (ClassWith__str__('abc'), 1))
|
|
|
|
# errors
|
|
self.assertRaises(TypeError, print, '', sep=3)
|
|
self.assertRaises(TypeError, print, '', end=3)
|
|
self.assertRaises(AttributeError, print, '', file='')
|
|
|
|
def test_print_flush(self):
|
|
# operation of the flush flag
|
|
class filelike:
|
|
def __init__(self):
|
|
self.written = ''
|
|
self.flushed = 0
|
|
|
|
def write(self, str):
|
|
self.written += str
|
|
|
|
def flush(self):
|
|
self.flushed += 1
|
|
|
|
f = filelike()
|
|
print(1, file=f, end='', flush=True)
|
|
print(2, file=f, end='', flush=True)
|
|
print(3, file=f, flush=False)
|
|
self.assertEqual(f.written, '123\n')
|
|
self.assertEqual(f.flushed, 2)
|
|
|
|
# ensure exceptions from flush are passed through
|
|
class noflush:
|
|
def write(self, str):
|
|
pass
|
|
|
|
def flush(self):
|
|
raise RuntimeError
|
|
self.assertRaises(RuntimeError, print, 1, file=noflush(), flush=True)
|
|
|
|
|
|
class TestPy2MigrationHint(unittest.TestCase):
|
|
"""Test that correct hint is produced analogous to Python3 syntax,
|
|
if print statement is executed as in Python 2.
|
|
"""
|
|
|
|
def test_normal_string(self):
|
|
python2_print_str = 'print "Hello World"'
|
|
with self.assertRaises(SyntaxError) as context:
|
|
exec(python2_print_str)
|
|
|
|
self.assertIn('print("Hello World")', str(context.exception))
|
|
|
|
def test_string_with_soft_space(self):
|
|
python2_print_str = 'print "Hello World",'
|
|
with self.assertRaises(SyntaxError) as context:
|
|
exec(python2_print_str)
|
|
|
|
self.assertIn('print("Hello World", end=" ")', str(context.exception))
|
|
|
|
def test_string_with_excessive_whitespace(self):
|
|
python2_print_str = 'print "Hello World", '
|
|
with self.assertRaises(SyntaxError) as context:
|
|
exec(python2_print_str)
|
|
|
|
self.assertIn('print("Hello World", end=" ")', str(context.exception))
|
|
|
|
def test_string_with_leading_whitespace(self):
|
|
python2_print_str = '''if 1:
|
|
print "Hello World"
|
|
'''
|
|
with self.assertRaises(SyntaxError) as context:
|
|
exec(python2_print_str)
|
|
|
|
self.assertIn('print("Hello World")', str(context.exception))
|
|
|
|
# bpo-32685: Suggestions for print statement should be proper when
|
|
# it is in the same line as the header of a compound statement
|
|
# and/or followed by a semicolon
|
|
def test_string_with_semicolon(self):
|
|
python2_print_str = 'print p;'
|
|
with self.assertRaises(SyntaxError) as context:
|
|
exec(python2_print_str)
|
|
|
|
self.assertIn('print(p)', str(context.exception))
|
|
|
|
def test_string_in_loop_on_same_line(self):
|
|
python2_print_str = 'for i in s: print i'
|
|
with self.assertRaises(SyntaxError) as context:
|
|
exec(python2_print_str)
|
|
|
|
self.assertIn('print(i)', str(context.exception))
|
|
|
|
def test_stream_redirection_hint_for_py2_migration(self):
|
|
# Test correct hint produced for Py2 redirection syntax
|
|
with self.assertRaises(TypeError) as context:
|
|
print >> sys.stderr, "message"
|
|
self.assertIn('Did you mean "print(<message>, '
|
|
'file=<output_stream>)"?', str(context.exception))
|
|
|
|
# Test correct hint is produced in the case where RHS implements
|
|
# __rrshift__ but returns NotImplemented
|
|
with self.assertRaises(TypeError) as context:
|
|
print >> 42
|
|
self.assertIn('Did you mean "print(<message>, '
|
|
'file=<output_stream>)"?', str(context.exception))
|
|
|
|
# Test stream redirection hint is specific to print
|
|
with self.assertRaises(TypeError) as context:
|
|
max >> sys.stderr
|
|
self.assertNotIn('Did you mean ', str(context.exception))
|
|
|
|
# Test stream redirection hint is specific to rshift
|
|
with self.assertRaises(TypeError) as context:
|
|
print << sys.stderr
|
|
self.assertNotIn('Did you mean', str(context.exception))
|
|
|
|
# Ensure right operand implementing rrshift still works
|
|
class OverrideRRShift:
|
|
def __rrshift__(self, lhs):
|
|
return 42 # Force result independent of LHS
|
|
|
|
self.assertEqual(print >> OverrideRRShift(), 42)
|
|
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|