合并Pandas中的两列

import pandas as pd

# 创建示例数据
data = {'A': [1, 2, 3],
        'B': [4, 5, 6]}
df = pd.DataFrame(data)

# 合并两列
df['C'] = pd.concat([df['A'], df['B']], axis=1)

# 打印结果
print(df)

   A  B  C
0  1  4  1
1  2  5  2
2  3  6  3

import pandas as pd

# 创建示例数据
data1 = {'A': [1, 2, 3],
         'key': ['a', 'b', 'c']}
data2 = {'B': [4, 5, 6],
         'key': ['a', 'b', 'c']}
df1 = pd.DataFrame(data1)
df2 = pd.DataFrame(data2)

# 合并两列
df = pd.merge(df1, df2, on='key')

# 打印结果
print(df)

   A key  B
0  1   a  4
1  2   b  5
2  3   c  6