Selecting rows with a certain weekday in DataFrame in Python

Question

I have a DataFrame with time index like:

df.index = [2013-09-09 06:23:18, 2013-09-10 07:09:05, ..., 2014-02-02 06:04:04]

How could I choose

Answer 1

You can get the weekday by df.index.weekday, note that Monday = 0 and Sunday = 6

To select the rows on Monday, you can do

df = df[df.index.weekday==0]

Answer 2

Here "Date" is the column name. Creating new column "weekday"

df["weekday"] = pd.to_datetime(df.Date).dt.dayofweek

From this column you can select any weekday from dataframe

df.loc[df["weekday"] ==6]

Here 6 denotes "Saturday"