Is in array (in)

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Is in array (in)#

This keyword allows you to check an element in an array.

list#

test_list = [1,2,3,4,5] 
print(5 in test_list)
print(6 in test_list)

True
False

tuple#

test_tuple = (1,2,3,4,5)
print(5 in test_tuple)
print(6 in test_tuple)

True
False

str#

test_str = "this is the test str contains subline to check it"

print("subline" in test_str)
print("subliner" in test_str)

True
False

dict#

Checks if the element on the left side of in is in the keys (not values) of the dictionary on the right side of in.

test_dict = {"a":1, "b":2}
print("a" in test_dict)
print(1 in test_dict)

True
False

not in#

This operator returns True if the collection from the right side of the operator contains the value from the left side of the operator, otherwise it returns False.

Looks like it’s syntax sugar, because now I don’t see any cases where it differs from the expression not (<value> in <collection>). The following example supports this idea.

example_collection = ["a", "b", "c"]

print(not ("a" in example_collection)) 
print("a" not in example_collection)

False
False
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