Python date validation program - output query

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My program converts a date to the 'dmy' format & checks if it's 'Ambiguous', 'True' (no ambiguity), or 'False'. I have used 'Date Parser' in this program .

Code Explanation:
1. Take a date
2. Convert it into the 'dmy' format using 'Date Parser'.
3. Split the date
4. If the first 2 parts(d & m) are in the same range (1-12) or when the length of 'Y' is 2 , then the date is ambiguous. Else, the date is true.
5. If the date is invalid, then 'False'.

My output for the test cases is supposed to be-->
False
Ambiguous
True

Observed output-->
False
Ambiguous
Ambiguous

My doubt -->
I'm getting the right output for the last test case when I change len(dmy_split[2])==2 to len(dmy_split[2])==0. I'm curious to know why '0' is working well for my code.

What I have tried:

Python

<pre>from dateutil.parser import parse
import re

def date_fun(date):
  
  try:
    dmy_split=re.split('[- / ]', date)
    dt = parse(date)
    dt.strftime('%d/%m/%Y')
   
    if (eval(dmy_split[0]) >=1 and eval(dmy_split[0]) <=12 and eval(dmy_split[1]) >=1 and eval(dmy_split[1]) <=12 or len(dmy_split[2])==2):
                                                 print("ambiguous")              # Format matched   
    else:
                                                     print("True")
  except ValueError:        # If match not found keep searching
                                                     #pass     
                                                     print("False")                                               

date_fun("abc")
date_fun("12/1/91")
date_fun("2002-09-18")

Posted 25-Aug-22 20:27pm

Apoorva 2022

Updated 25-Aug-22 22:24pm

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Richard MacCutchan 26-Aug-22 4:15am

Use the debugger, or add some print statements, to check what values are created in the first three lines of the try block.

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Richard MacCutchan · Accepted Answer · 2022-08-25T22:24:00

Well, I just tried that and the output is:

['2002', '09', '18']
2002-09-18 00:00:00
ambiguous

Which obviously shows that the date is not in the format that you assume. So if we look back at the line:

Python

dt.strftime('%d/%m/%Y')

we can see that it does not do anything useful.
So change that code to:

Python

dmy_split=re.split('[- / ]', date)
print(dmy_split)
dt = parse(date)
print(dt)
dt = dt.strftime('%d/%m/%Y')
print(dt)
dmy_split=re.split('[- / ]', dt)
print(dmy_split)

I have deliberately left the print statements so you can actually see what happens, and also how to do your own debugging.

Python date validation program - output query

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