I wrote a few functions which IMHO are missing in python(s itertools).
You can download them here:
http://sourceforge.net/project/showfiles.php?group_id=165721&package_id=212104
A short description to all the functions:
icmp(iterable1, iterable2) -> integer
Return negative if iterable1 < iterable2,
zero if iterable1 == iterable1,
positive if iterable1 > iterable1.
isum(iterable, start=0) -> value
Returns the sum of the elements of a iterable
plus the value of parameter 'start'. When the
iterable is empty, returns start.
iproduct(iterable, start=0) -> value
Returns the product of the elements of a iterable
times the value of parameter 'start'. When the
iterable is empty, returns start.
forall(predicate, iterable, default=True) -> bool
Returns True, when for all elements x in iterable
predicate(x) is True. When the iterable is empty,
returns default.
forany(predicate, iterable, default=False) -> bool
Returns True, when for any element x in iterable
predicate(x) is True. When the iterable is empty,
returns default.
take(n,iterable) -> iterator
returns a iterator over the first n
elements of the iterator
drop(n,iterable) -> iterable
drops the first n elemetns of iterable and
return a iterator over the rest
heads(iterable) -> iterator over all heads
example:
for head in heads([1,2,3,4,5,6,7,8,9]):
print head
output:
[]
[1]
[1, 2]
[1, 2, 3]
[1, 2, 3, 4]
[1, 2, 3, 4, 5]
[1, 2, 3, 4, 5, 6]
[1, 2, 3, 4, 5, 6, 7]
[1, 2, 3, 4, 5, 6, 7, 8]
[1, 2, 3, 4, 5, 6, 7, 8, 9]
tails(iterable) -> iterator over all tails
example:
for tail in tails([1,2,3,4,5,6,7,8,9]):
print tail
output:
[1, 2, 3, 4, 5, 6, 7, 8, 9]
[2, 3, 4, 5, 6, 7, 8, 9]
[3, 4, 5, 6, 7, 8, 9]
[4, 5, 6, 7, 8, 9]
[5, 6, 7, 8, 9]
[6, 7, 8, 9]
[7, 8, 9]
[8, 9]
[9]
[]
fcain(funct,*functs) -> function(...,***)
fcain(f1,f2,...,fn)(*args,*kwargs) equals f1(f2(...fn(*args,*kwargs)))
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