grouping by day of the week pandas

Question

  I have a dataframe,df 

        Index       eventName Count   pct
     2017-08-09       ABC     24     95.00%
     2017-08-09       CDE    140     98.50%
     2017-08-         


        

Answer 1

Wen's answer with value_counts is good, but does not account for the possibility of NaNs in the pct column.

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Assuming Index is the index, you can call groupby + count -

df.index = pd.to_datetime(df.index)
df.groupby(df.index.weekday_name).pct.count()

Index
Friday       2
Thursday     2
Wednesday    3
Name: pct, dtype: int64

To sort on weekday, convert to pd.Categorical, as shown here.