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Python: Add year(s) with a given date and display the new date

Python Datetime: Exercise-16 with Solution

Write a Python program to add year(s) with a given date and display the new date.

Sample Solution:

Python Code:

import datetime
from datetime import date
def addYears(d, years):
    try:
#Return same day of the current year        
        return d.replace(year = d.year + years)
    except ValueError:
#If not same day, it will return other, i.e.  February 29 to March 1 etc.        
        return d + (date(d.year + years, 1, 1) - date(d.year, 1, 1))

print(addYears(datetime.date(2015,1,1), -1))
print(addYears(datetime.date(2015,1,1), 0))
print(addYears(datetime.date(2015,1,1), 2))
print(addYears(datetime.date(2000,2,29),1))

Sample Output: 

2014-01-01                                                                                                    
2015-01-01                                                                                                    
2017-01-01                                                                                                    
2001-03-01

Flowchart:

Flowchart: Add year(s) with a given date and display the new date.

Python Code Editor:

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m