python教程新手应该知道的几个小技巧

>>> a =  "codementor"
>>> print "Reverse is",a[::-1]
Reverse is rotnemedoc

>>> mat = [[1, 2, 3], [4, 5, 6]]
>>> zip(*mat)
[(1, 4), (2, 5), (3, 6)]

>>> a = [1, 2, 3]
>>> x, y, z = a 
>>> x
1
>>> y
2
>>> z
3

>>> a = ["Code","mentor","Python","Developer"]                                                                         
>>> print " ".join(a)                                                                                 
Code mentor Python Developer  

>>> a=7
>>> b=5
>>> b, a =a, b
>>> a
5
>>> b
7

>>> print "code"*4+‘ ‘+"mentor"*5
codecodecodecode mentormentormentormentormentor

>>> import itertools 
>>>a = [[1, 2], [3, 4], [5, 6]]
>>> list(itertools.chain.from_iterable(a))
[1, 2, 3, 4, 5, 6]

>>> result = map(lambda x:int(x) ,raw_input().split())
1 2 3 4
>>> result
[1, 2, 3, 4]