Python Common libraries

http://blog.csdn.net/pipisorry/article/details/45830941

Collection Library Collection

Some special use cases, counter are very practical in some situations. If you've been in this year's Facebook Hackercup, you can even find out what's practical about him.

From collections Import Counter

Print Counter ("Hello")

>>> Counter ({' L ': 2, ' h ': 1, ' E ': 1, ' O ': 1})

Iterative Tools Library Itertools

As with the collections library, there is a library called Itertools, which can be effectively solved for some problems. One of the use cases is to find all the combinations that he can tell you about all the combinations of elements in a group

From Itertools import combinations

Teams = ["Packers", "49ers", "Ravens", "patriots"]

For-game in combinations (teams, 2):

Print game

>>> (' Packers ', ' 49ers ')

>>> (' Packers ', ' Ravens ')

>>> (' Packers ', ' patriots ')

>>> (' 49ers ', ' Ravens ')

>>> (' 49ers ', ' patriots ')

>>> (' Ravens ', ' patriots ')

from:http://blog.csdn.net/pipisorry/article/details/45830941

Python Common libraries