需求：['1:a','2:b','3:c'] 转换为 {'1′: 'a','3′: 'c','2′: ''}

复制代码 代码如下:

a = {}

b = ['1:a','2:b','3:c']

map(lambda x:a.setdefault(x.split(':')[0], x.split(':')[1]), b)

print a

{'1': 'a', '3': 'c', '2': 'b'}