Python in the operator is used to check if a value exists in a group of values (string, list, tuple, etc). The in operator returns True if an element is found. It returns False if not.
Python in operator
A simple example code check specified value is inside the sequence.
list1 = [1, 2, 3, 4, 5]
print(5 in list1) # True
s = "A is A"
print("is" in s) # True
tuple1 = (11, 22, 33, 44)
print(88 in tuple1) # False
Output:

Let’s see the in operator in the if..else condition.
s = "Game of Thrones was the good show"
if "Thrones" in s:
print('It exists')
else:
print('Does not exist')
Output: It exists
Note: Python not in operator work opposite of in operator.
Do comment if you have any doubts or suggestions on this Python operator topic.
Note: IDE: PyCharm 2021.3.3 (Community Edition)
Windows 10
Python 3.10.1
All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.

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