how to get day before python date code example

Example 1: python today - 1 day

from datetime import datetime, timedelta

yesterday = datetime.today() - timedelta(days = 1 )

Example 2: python timestamp shift one day

from datetime import datetime, timedelta
print datetime.now() + timedelta(days=5, hours=-5)

Example 3: 1 day ago python datetime

date_N_days_ago = datetime.now() - timedelta(days=N)

Example 4: remove days when subtracting time python

df_test['Difference'] = (df_test['First_Date'] - df_test['Second Date']).dt.days