Pandas filter dataframe rows with a specific year

Question

I have a dataframe df and it has a Date column. I want to create two new data frames. One which contains all of the rows from df where

Answer 1

You can use datetime accesor.

import datetime as dt
df['Date'] = pd.to_datetime(df['Date'])

include = df[df['Date'].dt.year == year]
exclude = df[df['Date'].dt.year != year]

Answer 2

You can simplify it by inverting mask by ~ and for condition use Series.dt.year with int for cast string year:

mask = df['Date'].dt.year == int(year)
include = df[mask]
exclude = df[~mask]