1 df.groupby.count
different with
df.groupby.iloc[a_col].count
2 nan become nat when concat to a df which the col conrespond type is time
1 df.groupby.count
different with
df.groupby.iloc[a_col].count
2 nan become nat when concat to a df which the col conrespond type is time
1. find$ find . -name ...
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