[英]Pandas DataFrame - delete rows that have same value at a particular column as a previous row
[英]pandas: delete a row having same value of a column as in previous raw
這是我的df:
data = { 'utime': [1461098442,1461098443,1461098443,1461098444,1461098445],
'lat': [41.1790265,41.1791703,41.1791464,41.1791703,41.1791419],
'lon': [-8.5951883,-8.5951229,-8.5951376,-8.5951229,-8.5951365]
}
df = pd.DataFrame(data)
df
utime lat lon
0 1461098442 41.179026 -8.595188
1 1461098443 41.179170 -8.595123
2 1461098443 41.179146 -8.595138
3 1461098444 41.179170 -8.595123
4 1461098445 41.179142 -8.595137
同時收到兩個樣本(unix epoch 1461098443
),所以我想保留 1,刪除另一個。
所以我有
utime lat lon
0 1461098442 41.179026 -8.595188
1 1461098443 41.179170 -8.595123
3 1461098444 41.179170 -8.595123
4 1461098445 41.179142 -8.595137
drop_duplicates 應該有所幫助(閱讀https://pandas.pydata.org/docs/reference/api/pandas.DataFrame.drop_duplicates.ZFC35FDC70D5FC69D269883A822C7A )
df.drop_duplicates(subset='utime')
df = df.groupby('utime', as_index=False).agg('first')
utime lat lon
0 1461098442 41.179026 -8.595188
1 1461098443 41.179170 -8.595123
2 1461098444 41.179170 -8.595123
3 1461098445 41.179142 -8.595137
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