python_dict()字典

1.两个list组成字典

kList = ['a','b','c']vList = [1,2,3]aDict = dict(zip(kList,vList))print aDict

2.fromkeys生成字典

aDict = {}.fromkeys(['n','h','c'],0)
=>{'h': 0, 'c': 0, 'n': 0}
用该函数的第一个参数必须是一个序列,元组也可以
3.序列生成字典(序列必须有一一对应的关系)
aDict = {}.fromkeys(['n','h','c'],0)
for i in range(len(aDict)):    aDict[aDict.keys()[i]] = vList[i]
4.元组生成字典:s = (('a',1),('b',2))
aDict=dict(s)
  或
s = (['a',1],['b',2])
aDict=dict(s)
  或
s = [['a',1],['b',2]]aDict=dict(s)print aDict
  或
s = ([['a',1],['b',2]])aDict=dict(s)print aDict

3.字典合并
aDict.update(bDict)
aDict会增加bDict中的元素(在aDict中没有,在bDict中存在的元素)