for item in list[:-1]:
print "Not last: ", item
print "Last: ", list[-1]
# itr is short for "iterable" and can be any sequence, iterator, or generator
def notlast(itr):
itr = iter(itr) # ensure we have an iterator
prev = itr.next()
for item in itr:
yield prev
prev = item
# lst is short for "list" and does not shadow the built-in list()
# 'L' is also commonly used for a random list name
lst = range(4)
for x in notlast(lst):
print "Not last: ", x
print "Last: ", lst[-1]
notlast的另一种定义：
import itertools
notlast = lambda lst:itertools.islice(lst, 0, len(lst)-1)
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