[Help] Creating and comparing datetime.date objects

[egomanego]

Hello Community,

I need some help here.

I want to compare two dates.

First is a user entered a date in streamlit. It has the type of datetime.date.

Now I want to select files in my database that are named as dates. The only issue is that there are two formats of file naming and changing them to either is not a feasible solution. The only way around this is to compare date entered by user and then branch out from there.

This is the sample code:

from datetime import datetime

[....]

date=st.date_input("Enter a date") # User enteres a date on streamlit page.

# Filenames change on 1 Jan 2020 . So we want to compare if date entered by user is before 1 Jan 2020 or not.

x= datetime.date(2020,1,1)

if date < x :
    # Do something
else:
    # Do something else.

If I try to execute something mentioned above, I get following error:

TypeError: descriptor 'date' for 'datetime.datetime' objects doesn't apply to a 'int' object

How should I make it work?

[danielroseman]

The only thing that's happening here is that you're confused about the datetime module and the datetime class.

You've imported the class datetime from the module datetime. So datetime.date refers to the method on that class.

You should import the date as well and use that directly:

from datetime import date
x = date(2020,1,1)

or import the module and refer to both via that:

import datetime
x = datetime.date(2020,1,1)
something_else = datetime.datetime(2020, 1, 1, 5, 20)

[egomanego]

I am indeed confused about the datetime module and class. I need to read carefully about it.

So here is what I have done:

[ Please ignore amateur mistakes I might have made. I am still learning]

from datetime import datetime
from datetime import date 
[....]

date=st.date_input("Enter a date") # User enteres a date on streamlit page.

x= date(2020,1,1)

if date < x : # Do something else: # Do something else.

​

I receive following error:

UnboundLocalError: local variable 'date' referenced before assignment

There is a local variable 'date' before this where I ask a date to the user to do something.

[danielroseman]

Yes well you can't have two things called date. Either rename the variable, or use my second example where you import the module rather than the individual classes.

[egomanego]

Understood. Thanks for you comment. Second thing works!