df和dict转换，以及dict的key和value的转换

import pandas as pd
data &＃61; pd.DataFrame([[‘a’,1],[‘b’,2]], columns&＃61;[‘key’,‘value’])
dict1 &＃61; dict(zip(data[‘key’],data[‘value’]))

a_dict &＃61; {‘a’: 1, ‘b’: 2, ‘c’: 3}
{value:key for key, value in a_dict.items()}
{1: ‘a’, 2: ‘b’, 3: ‘c’}

dic &＃61; {‘a’:1, ‘b’:2, ‘c’:3}
dic_new &＃61; dict(zip(dic.values(), dic.keys()))
print(dic_new)

{1: ‘a’, 2: ‘b’, 3: ‘c’}

dic &＃61; {‘a’:1, ‘b’:2, ‘c’:3}
dic_new &＃61; {}
for key, val in dic.items():
dic_new[val] &＃61; key
print(dic_new)

{1: ‘a’, 2: ‘b’, 3: ‘c’}

dic_new &＃61; dict([val, key] for key, val in dic.items())
print(dic_new)

{1: ‘a’, 2: ‘b’, 3: ‘c’}