Python：将一列添加到 dataframe 中，具有不同的长度重复添加的列直到填充 dataframe 长度

Question

Hos I could a do this one:

Df1:

A	B
01	AA
02	AB
03	AC
05	AD

Df2:

C
11
12

Dataframe looking for:

A	B	C
01	AA	11
02	AB	12
03	AC	11
05	AD	12

How could I reach this solution?

Answer 1

You can use np.tile to repeat the elements of column C :

m, n = len(df1), len(df2)
df1['C'] = np.tile(df2['C'], int(np.ceil(m / n)))[:m]

Result:

   A   B   C
0  1  AA  11
1  2  AB  12
2  3  AC  11
3  5  AD  12

Answer 2

You can do concat :

   >>> pd.concat([df1,df2.append(df2).reset_index(drop=True)],axis=1)

       A   B     C
    0  1  AA  11.0
    1  2  AB  12.0
    2  3  AC  11.0
    3  5  AD  12.0