嘿，我有这样的数据框
Descriptions
1. i am going in car
2. He will go for match
3. D-1799
4. nothing better
5. SS-1428
6. going towards the office
7. GTY6QD12
另一个Dataframe具有上面dataframne中提到的代码，并在下一栏中进行描述。
code Description
1. D-1799 he is moving now
2. SS-1428 they will have some
3. GTY6QD12 is it well now
我希望第一个数据框填充基于代码的第二个数据框的代码描述。所需的结果应该是这样的。
Descriptions
1. i am going in car
2. He will go for match
3. he is moving now
4. nothing better
5. they will have some
6. going towards the office
7. is it well now
使用Series.replace通过Series从df2所创造DataFrame.set_index和选择Descriptions列：
s = df2.set_index('code')['Description']
df1['Descriptions'] = df1['Descriptions'].replace(s)
print (df1)
Descriptions
0 i am going in car
1 He will go for match
2 he is moving now
3 nothing better
4 they will have some
5 going towards the office
6 is it well now
如果需要子字符串替换，请添加regex=True：
df1['Descriptions'] = df1['Descriptions'].replace(s, regex=True)
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