Home Code How to check a value against multiple variables in Python?

How to check a value against multiple variables in Python?

Suppose you have multiple variables declared in Python and want to check if any of them equals a given value. The usual way of doing this is as follows.

x = 5 y = 12 z = 39 if x == 11 or y == 11 or z ==11: print("value exists in variables") else: print("value does not exist in variables")
Code language: Python (python)

But an even more pythonic way of getting the same thing done is as follows.

if 11 in {x,y,z}: print("value exists in variables") else: print("value does not exist in variables")
Code language: Python (python)

In the above code, we are creating a set containing all the variables. And then simply checking whether the value in question is a member of the set or not. This is a more readable and a more pythonic way to check whether a value exists in a given list of variables.

Check whether a value exists in a list in Python

The same notation can also be used to check whether a value exists in a list in Python.

lst = [13,44,56,7] if 11 in lst: print("value exists in list") else: print("value does not exist in list")
Code language: Python (python)

This works well for small lists. However, if the list is very large, it would be better to convert it into a set, and then do the comparison.

lst = [13,44,56,7] st = set(lst) if 11 in st: print("value exists in list") else: print("value does not exist in list")
Code language: Python (python)

That will increase the speed, because in case of list, the program will have to check the value against each variable in the list. But in case of a set, it is a simple hash check, because set is implemented as a hash table in Python.

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Gurudev is the developer of Gurunudi AI Platform. This is his official website where he pens his thoughts on a wide range of topics, answers queries, shares resources and tools developed by him.

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