创建一个新的pandas列，并根据另一列重复一个值

import pandas as pd

data = {'A': [1, 2, 3, 4, 5]}
df = pd.DataFrame(data)

df = df.assign(B=df['A'].repeat(2))

import pandas as pd

data = {'A': [1, 2, 3, 4, 5]}
df = pd.DataFrame(data)

df = df.assign(B=df['A'].repeat(2))