我想在Pandas中合并以下两个数据帧，但结果不包含所有相关列：
L1aIn[0:5]文件名OrbitNumber OrbitMode
OrbitModeCounter Year Month Day L1aIn
0 oco2_L1aInDP_35863a_210329_B10206_210330111927.h5 35863 DP a 2021 3 29 1
1 oco2_L1aInDP_35862a_210329_B10206_210330111935.h5 35862 DP a 2021 3 29 1
2 oco2_L1aInDP_35861b_210329_B10206_210330111934.h5 35861 DP b 2021 3 29 1
3 oco2_L1aInLP_35861a_210329_B10206_210330111934.h5 35861 LP a 2021 3 29 1
4 oco2_L1aInSP_35861a_210329_B10206_210330111934.h5 35861 SP a 2021 3 29 1
L2Std[0:5]
Filename OrbitNumber OrbitMode OrbitModeCounter Year Month Day L2Std
0 oco2_L2StdGL_35861a_210329_B10206r_21042704283... 35861 GL a 2021 3 29 1
1 oco2_L2StdXS_35860a_210329_B10206r_21042700342... 35860 XS a 2021 3 29 1
2 oco2_L2StdND_35852a_210329_B10206r_21042622540... 35852 ND a 2021 3 29 1
3 oco2_L2StdGL_35862a_210329_B10206r_21042622403... 35862 GL a 2021 3 29 1
4 oco2_L2StdTG_35856a_210329_B10206r_21042622422... 35856 TG a 2021 3 29 1
>>> df = L1aIn.copy(deep=True)
>>> df.merge(L2Std, how="outer", on=["OrbitNumber","OrbitMode","OrbitModeCounter"])
0 oco2_L1aInDP_35863a_210329_B10206_210330111927.h5 35863 DP a ... NaN NaN NaN NaN
1 oco2_L1aInDP_35862a_210329_B10206_210330111935.h5 35862 DP a ... NaN NaN NaN NaN
2 oco2_L1aInDP_35861b_210329_B10206_210330111934.h5 35861 DP b ... NaN NaN NaN NaN
3 oco2_L1aInLP_35861a_210329_B10206_210330111934.h5 35861 LP a ... NaN NaN NaN NaN
4 oco2_L1aInSP_35861a_210329_B10206_210330111934.h5 35861 SP a ... NaN NaN NaN NaN
5 NaN 35861 GL a ... 2021.0 3.0 29.0 1.0
6 NaN 35860 XS a ... 2021.0 3.0 29.0 1.0
7 NaN 35852 ND a ... 2021.0 3.0 29.0 1.0
8 NaN 35862 GL a ... 2021.0 3.0 29.0 1.0
9 NaN 35856 TG a ... 2021.0 3.0 29.0 1.0
[10 rows x 13 columns]
>>> df.columns
Index(['Filename', 'OrbitNumber', 'OrbitMode', 'OrbitModeCounter', 'Year',
'Month', 'Day', 'L1aIn'],
dtype='object')
我希望得到的合并表包括"；L1aIn"；以及"；L2Std"；列，但正如您所看到的，它没有，只从L1aIn中提取原始列。
我也很困惑为什么它似乎返回了一个数据帧对象而不是None。
玩具的例子对我来说很好，但现实生活中的例子却不行。是什么情况引发了合并的这种行为？
在我看来，你只需要一个变量到的输出
merged_df = df.merge(L2Std, how="outer", on=["OrbitNumber","OrbitMode","OrbitModeCounter"])
print(merged_df.columns)