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Add optional third parameter to split() and splitfields(), giving the

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maximum number of delimiters to parse; e.g.
splitfields("a,b,c,d", ",", 2) -> ["a", "b", "c,d"].
This commit is contained in:
Guido van Rossum 1996-08-08 18:40:59 +00:00
parent a59d3e6d50
commit 306a8a6338
2 changed files with 44 additions and 8 deletions
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26
Lib/string.py
View File

@ -55,10 +55,23 @@ def strip(s):
while i < j and s[j-1] in whitespace: j = j-1
return s[i:j]
# Strip leading tabs and spaces
def lstrip(s):
i, j = 0, len(s)
while i < j and s[i] in whitespace: i = i+1
return s[i:j]
# Strip trailing tabs and spaces
def rstrip(s):
i, j = 0, len(s)
while i < j and s[j-1] in whitespace: j = j-1
return s[i:j]
# Split a string into a list of space/tab-separated words
# NB: split(s) is NOT the same as splitfields(s, ' ')!
def split(s, sep=None):
if sep is not None: return splitfields(s, sep)
def split(s, sep=None, maxsplit=0):
if sep is not None: return splitfields(s, sep, maxsplit)
res = []
i, n = 0, len(s)
while i < n:
@ -73,18 +86,23 @@ def split(s, sep=None):
# Split a list into fields separated by a given string
# NB: splitfields(s, ' ') is NOT the same as split(s)!
# splitfields(s, '') returns [s] (in analogy with split() in nawk)
def splitfields(s, sep=None):
if sep is None: return split(s)
def splitfields(s, sep=None, maxsplit=0):
if sep is None: return split(s, None, maxsplit)
res = []
nsep = len(sep)
if nsep == 0:
return [s]
ns = len(s)
i = j = 0
count = 0
while j+nsep <= ns:
if s[j:j+nsep] == sep:
count = count + 1
res.append(s[i:j])
i = j = j + nsep
if (maxsplit and (count >= maxsplit)):
break
else:
j = j + 1
res.append(s[i:])

26
Lib/stringold.py
View File

@ -55,10 +55,23 @@ def strip(s):
while i < j and s[j-1] in whitespace: j = j-1
return s[i:j]
# Strip leading tabs and spaces
def lstrip(s):
i, j = 0, len(s)
while i < j and s[i] in whitespace: i = i+1
return s[i:j]
# Strip trailing tabs and spaces
def rstrip(s):
i, j = 0, len(s)
while i < j and s[j-1] in whitespace: j = j-1
return s[i:j]
# Split a string into a list of space/tab-separated words
# NB: split(s) is NOT the same as splitfields(s, ' ')!
def split(s, sep=None):
if sep is not None: return splitfields(s, sep)
def split(s, sep=None, maxsplit=0):
if sep is not None: return splitfields(s, sep, maxsplit)
res = []
i, n = 0, len(s)
while i < n:
@ -73,18 +86,23 @@ def split(s, sep=None):
# Split a list into fields separated by a given string
# NB: splitfields(s, ' ') is NOT the same as split(s)!
# splitfields(s, '') returns [s] (in analogy with split() in nawk)
def splitfields(s, sep=None):
if sep is None: return split(s)
def splitfields(s, sep=None, maxsplit=0):
if sep is None: return split(s, None, maxsplit)
res = []
nsep = len(sep)
if nsep == 0:
return [s]
ns = len(s)
i = j = 0
count = 0
while j+nsep <= ns:
if s[j:j+nsep] == sep:
count = count + 1
res.append(s[i:j])
i = j = j + nsep
if (maxsplit and (count >= maxsplit)):
break
else:
j = j + 1
res.append(s[i:])