MEMBERSHIP OPERATOR IN PYTHON

Python’s membership operators test whether a value or variable is found in a sequence (string, list, tuple, set and dictionary). If the value is present in the data structure, then the resulting value is true otherwise it returns false. These membership operator in python are an example of what makes Python so easy to use compared to lower-level languages such as C.

in         True if value is found in the sequence
not in     True if value is not found in the sequence

Example 1:

>>> print (2 in {2,3,4})
>>> print( 'e' in ('aeiou'))

output:
True
True

Example 02:

# In a dictionary we can only test for presence of key, not the value
>>> a = { "s":"sawid",
        "d":"diwas"}
>>> print ("s" in a)
>>> print ("sawid" not in a)

OUTPUT:
True
True