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Revised the itertools quantifier recipes to match the performance of the

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new builtins.
This commit is contained in:
Raymond Hettinger 2005-03-11 22:17:30 +00:00
parent 96229b1918
commit f77d0334f3
2 changed files with 16 additions and 16 deletions
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16
Doc/lib/libitertools.tex
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@ -461,26 +461,26 @@ def nth(iterable, n):
"Returns the nth item" "Returns the nth item"
return list(islice(iterable, n, n+1)) return list(islice(iterable, n, n+1))
def all(seq, pred=bool): def all(seq, pred=None):
"Returns True if pred(x) is True for every element in the iterable" "Returns True if pred(x) is true for every element in the iterable"
for elem in ifilterfalse(pred, seq): for elem in ifilterfalse(pred, seq):
return False return False
return True return True
def any(seq, pred=bool): def any(seq, pred=None):
"Returns True if pred(x) is True for at least one element in the iterable" "Returns True if pred(x) is true for at least one element in the iterable"
for elem in ifilter(pred, seq): for elem in ifilter(pred, seq):
return True return True
return False return False
def no(seq, pred=bool): def no(seq, pred=None):
"Returns True if pred(x) is False for every element in the iterable" "Returns True if pred(x) is false for every element in the iterable"
for elem in ifilter(pred, seq): for elem in ifilter(pred, seq):
return False return False
return True return True
def quantify(seq, pred=bool): def quantify(seq, pred=None):
"Count how many times the predicate is True in the sequence" "Count how many times the predicate is true in the sequence"
return sum(imap(pred, seq)) return sum(imap(pred, seq))
def padnone(seq): def padnone(seq):

16
Lib/test/test_itertools.py
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@ -799,26 +799,26 @@ def gen2(x):
... "Returns the nth item" ... "Returns the nth item"
... return list(islice(iterable, n, n+1)) ... return list(islice(iterable, n, n+1))
>>> def all(seq, pred=bool): >>> def all(seq, pred=None):
... "Returns True if pred(x) is True for every element in the iterable" ... "Returns True if pred(x) is true for every element in the iterable"
... for elem in ifilterfalse(pred, seq): ... for elem in ifilterfalse(pred, seq):
... return False ... return False
... return True ... return True
>>> def any(seq, pred=bool): >>> def any(seq, pred=None):
... "Returns True if pred(x) is True for at least one element in the iterable" ... "Returns True if pred(x) is true for at least one element in the iterable"
... for elem in ifilter(pred, seq): ... for elem in ifilter(pred, seq):
... return True ... return True
... return False ... return False
>>> def no(seq, pred=bool): >>> def no(seq, pred=None):
... "Returns True if pred(x) is False for every element in the iterable" ... "Returns True if pred(x) is false for every element in the iterable"
... for elem in ifilter(pred, seq): ... for elem in ifilter(pred, seq):
... return False ... return False
... return True ... return True
>>> def quantify(seq, pred=bool): >>> def quantify(seq, pred=None):
... "Count how many times the predicate is True in the sequence" ... "Count how many times the predicate is true in the sequence"
... return sum(imap(pred, seq)) ... return sum(imap(pred, seq))
>>> def padnone(seq): >>> def padnone(seq):