PYTHON字典常用函数

1.clear

dict.clear()

2.copy

a,b用的字典引用位置是相同的，a or b相互受对方影响

所以有时候需要用到copy and deepcopy函数

a = b = dict

1>

b = a.copy()

发生替换双方值不换相互影响,涉及新增 删除会相互影响

2>deepcopy

from copy import deepcopy

b = deepcopy(a)

3.get

dict.get('key',' ')

4.has_key() 注:python3.0已经没有该函数

dict.has_key('key')

5.items and iteritems

dict.items()

for k,v in dict.items():

    print k

    print v

for k,v in list(dict.iteritems()):

    print k

    print v

6.keys and iterkeys

for k in dict.keys():

    print k

for k in list(dict.iterkeys()):

    print k

7.values and itervalues

for v in dict.values():

    print v

for v in list(dict.itervalues()):

    print v

8.pop

移除字典当中键和值

dict = {'name':'az','age':'18'}

dict.pop('name')

dict = {'age':'18'}

9.update

存在就更新，不存在就加入

dict.update(dict2)