Pythonic way for checking equality in AND condition

Question

I have a piece of code which looks like below:

a = None
b = None
c = None
d = None

if a==None and b==None and c==None and d==None:
    print("All are None")
else:
    print("Someone is not None")

What would be the pythonic way or shorter way to achieve this as I have more number of variables to check like this?

well these variables comes from frontend,

Hemant Sah
– Hemant Sah

2022-03-09 06:54:13 +00:00
Commented Mar 9, 2022 at 6:54 — Hemant Sah
– Hemant Sah, Commented Mar 9, 2022 at 6:54

QuantumMecha · Accepted Answer · 2022-03-09 06:54:06Z

5

You can use a list, and check all items in the list using list comprehension:

l_list = [None, None, None, None, None]
if all(item is None for item in l_list):
    print("All items are None")

edited Mar 9, 2022 at 6:54

answered Mar 9, 2022 at 6:51

QuantumMecha

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1 Comment

Hemant Sah Over a year ago

This approach is working for me, but there are some more answers which is giving the same results as I want. If possible could you explain me which could be an efficient way?

blhsing · Accepted Answer · 2022-03-09 06:56:08Z

2

You can chain the comparisons:

if a is b is c is d is None:
    print("All are None")
else:
    print("Someone is not None")

answered Mar 9, 2022 at 6:56

blhsing

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Comments

shahkalpesh · Accepted Answer · 2022-03-09 06:52:33Z

-1

if not all((a, b, c, d)):

or

if not any((a, b, c, d)): if you want to check if any of the item is not None

Does this help?

edited Mar 9, 2022 at 6:52

answered Mar 9, 2022 at 6:49

shahkalpesh

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3 Comments

Hemant Sah Over a year ago

Nope, If I change None to some value in any of variable, it still goes in if condtion, it should go in else printing "Some one is not none". If all the variables are not None, then it goes to else condition

Mark Over a year ago

Since the OP is asking if items are None you need to test against it specifically. Consider the possibility that these variables might be 0, False, [], etc.

shahkalpesh Over a year ago

@Mark: Yes, I agree.

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