相关疑难解决方法(0)

我有两个这样的数据框

import pandas as pd
import numpy as np

df1 = pd.DataFrame({
    'key': list('AAABBCCAAC'),
    'prop1': list('xyzuuyxzzz'),
    'prop2': list('mnbnbbnnnn')
})

df2 = pd.DataFrame({
    'key': list('ABBCAA'),
    'prop1': [np.nan] * 6,
    'prop2': [np.nan] * 6,
    'keep_me': ['stuff'] * 6
})

  key prop1 prop2
0   A     x     m
1   A     y     n
2   A     z     b
3   B     u     n
4   B     u     b
5   C     y     b
6   C     x     n
7   A     z     n
8   A     z     n
9   C     z     n …