Python反转字典的key和value

1. 遍历

   m = {'a': 1, 'b': 2, 'c': 3}
   n = {}
   for k, v in m.items():
       n[v] = k
   print(n)
   

2. 字典推导式

   m = {'a': 1, 'b': 2, 'c': 3}
   n = {v: k for k, v in m.items()}
   print(n)
   

3. 使用zip函数

   m = {'a': 1, 'b': 2, 'c': 3}
   n = dict(zip(m.values(), m.keys()))
   print(n)
   

4. 结合map和reversed函数

   m = {'a': 1, 'b': 2, 'c': 3}
   n = dict(map(reversed, m.items()))
   print(n)