[Python-checkins] peps: In the examples section, show how zip() is reversible. (original) (raw)

Wed Mar 23 21:22:30 CET 2011

__getitem__() raises IndexError immediately if no sequences were
given.

__len__() returns 0 if no sequences were given.

__cmp__() new method
     def __getitem__(self, i):
       if not self.__sequences:
           raise IndexError
       ret = []
       exhausted = 0
       for s in self.__sequences:
           if shortest < 0:
               return 0
           return shortest
       longest = 0
       for s in self.__sequences:
   def __cmp__(self, other):
       i = 0
       smore = 1
       omore = 1
       while 1:
           try:
               si = self[i]
           except IndexError:
               smore = 0
           try:
               oi = other[i]
           except IndexError:
               omore = 0
           if not smore and not omore:
               return 0
           elif not smore:
               return -1
           elif not omore:
               return 1
           test = cmp(si, oi)
           if test:
               return test
           i = i + 1
    def __str__(self):
        ret = []
        i = 0
   3) Raises TypeError
    Pros: None
    Pros: zip(a) doesn't make much sense and could be confusing
    to explain.

    Cons: needless restriction
 plait, and with.  All have disadvantages, and there is no clear
 unanimous choice, therefore the decision was made to go with
 `zip' because the same functionality is available in other
 plait, fold, and with.  All have disadvantages, and there is no
 clear unanimous choice, therefore the decision was made to go
 with `zip' because the same functionality is available in other
 languages (e.g. Haskell) under the name `zip'[2].