How to Print next year from current year in Python

Question

How can I print the next year if the current year is given in python using the simplest code, possibly in one line using datetime module.

Answer 1

Both date and datetime objects have a year attribute, which is a number. Just add 1:

>>> from datetime import date >>> print date.today().year + 1 2013 

If you have the current year in a variable, just add 1 directly, no need to bother with the datetime module:

>>> year = 2012 >>> print year + 1 2013 

If you have the date in a string, just select the 4 digits that represent the year and pass it to int:

>>> date = '2012-06-26' >>> print int(date[:4]) + 1 2013 

Year arithmetic is exceedingly simple, make it an integer and just add 1. It doesn't get much simpler than that.

If, however, you are working with a whole date, and you need the same date but one year later, use the components to create a new date object with the year incremented by one:

>>> today = date.today() >>> print date(today.year + 1, today.month, today.day) 2013-06-26 

or you can use the .replace function, which returns a copy with the field you specify changed:

>>> print today.replace(year=today.year + 1) 2013-06-26 

Note that this can get a little tricky when today is February 29th in a leap year. The absolute, fail-safe correct way to work this one is thus:

def nextyear(dt):    try:        return dt.replace(year=dt.year+1)    except ValueError:        # February 29th in a leap year        # Add 365 days instead to arrive at March 1st        return dt + timedelta(days=365)