Python: Validate a Gregorian date

Last update on May 28 2022 13:35:05 (UTC/GMT +8 hours)

Python Datetime: Exercise-53 with Solution

Write a Python program to validate a Gregorian date. The month is between 1 and 12 inclusive, the day is within the allowed number of days for the given month. Leap year’s are taken into consideration. The year is between 1 and 32767 inclusive.

Sample Solution:

Python Code:

import datetime
def check_date(m, d, y):
    try:
        m, d, y = map(int, (m, d, y))
        datetime.date(y, m, d)
        return True
    except ValueError:
        return False

print(check_date(11, 11, 2002))
print(check_date('11', '11', '2002'))
print(check_date(13, 11, 2002))

Sample Output:

True
True
False

Flowchart:

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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