Python的enumerate函数python的enumerate函数

实现一个列表变成字典，可以用enumerate函数

• input = [‘a’, ‘b’, ‘c’ , ‘d’ , ‘e’]
• {f: i for f, i in zip(input, range(len(input)))}
• {‘a’: 0, ‘c’: 2, ‘b’: 1, ‘e’: 4, ‘d’: 3}
• dict(zip(input, range(len(input))))
• {‘a’: 0, ‘c’: 2, ‘b’: 1, ‘e’: 4, ‘d’: 3}
• list(enumerate(input))
• [(0, ‘a’), (1, ‘b’), (2, ‘c’), (3, ‘d’), (4, ‘e’)]
• dict(enumerate(input))
• {0: ‘a’, 1: ‘b’, 2: ‘c’, 3: ‘d’, 4: ‘e’}
• {f:i for i, f in enumerate(input)}
• {‘a’: 0, ‘c’: 2, ‘b’: 1, ‘e’: 4, ‘d’: 3}