Managing date in Python

Question

I'm a total noob in Python and I'm currently reading a script provided by a colleague. I got confused with the below script having it run today.

import datetime

today=datetime.date.today() - datetime.timedelta(days=4)
print (today)

if today.weekday() in [range(0,7)]:
    saturday=today-datetime.timedelta(today.weekday()-5)
    sunday=today-datetime.timedelta(today.weekday()-6)
else:
    saturday=today-datetime.timedelta(today.weekday()+2)
    sunday=today-datetime.timedelta(today.weekday()+1)

print (saturday)
print (sunday)
print (today.weekday())

Below is the result:

Why is the script executing the one in else-statement? The today.weekday() results to 3 which should've executed the if-statement since 3 is within the range which if manually computed saturday = 2018-07-21.

Kindly advise where I have it understood incorrectly.

Using the correction from @Piotrek or @ThatBird, please note that today.weekday() in range(0,7) will always evaluate to True so the else statement is not reachable — Benoit Guigal
– Benoit Guigal, Commented Jul 23, 2018 at 9:04

Sushant · Accepted Answer · 2018-07-23 09:00:23Z

2

In this line -

if today.weekday() in [range(0,7)]

range() already gives you a list but in this case, it is a list of list and you get something like -

[[0, 1, 2, 3, 4, 5, 6]]

And as you see, 3 is not in [[0, 1, 2, 3, 4, 5, 6]]

But if it were something like -

[[0, 1, 2, 3, 4, 5, 6], 3] #then it would have been true

Remove the brackets and make it this -

if today.weekday() in range(0,7)

And it should work

answered Jul 23, 2018 at 9:00

Sushant

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2 Comments

Janine Over a year ago

Hi! Thank you for explaining this to me. If I proceed with your instruction, when will the above script execute the else statement? Isn't each day assigned an integer from 0 to 7? If so, it will always execute the if statement, right?

Sushant Over a year ago

@Janine you are right. It won't go in else statement

Piotrek · Accepted Answer · 2018-07-23 09:02:24Z

1

Change

if today.weekday() in [range(0,7)]:

to:

if today.weekday() in range(0,7):

and it will work properly.

answered Jul 23, 2018 at 9:02

Piotrek

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