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Python Membership and Identity Operators | in, not in, is, not

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Membership Operators — these are the operators used to test the membership of a value. It checks the membership of a sequence such as strings, lists, or tuples.

  1. in Operator: The in operator is used to test whether a value exists in a sequence or not. True if it finds the variable in the specified sequence, false otherwise.

    # Python program for illustration
    # Find a common member in the list
    # using the" in "operator

    list1 = [ 1 , 2 , 3 , 4 , 5 ]

    list2 = [ 6 , 7 , 8 , 9 ]

    for item in list1:

    if item in list2:

    print ( "overlapping"

    else :

    print ( "not overlapping" )

    Exit :

     not overlapping 

    The same example without using in a statement:

    # Python program for illustration
    # Find a common member in the list
    # without using the "in" operator

     
    # Define a function () that takes two lists

    def overlapping ( list1, list2): 

     

    c = 0

      d = 0

    for i in list1:

    c + = 1

      for i in list2:

      d + = 1

    for i in range ( 0 , c):

    for j in range ( 0 , d):

    if (list1 [i] = = list2 [j]):

    return 1

    return 0

    list1 = [ 1 , 2 , 3 , 4 , 5 ]

    list2 = [ 6 , 7 , 8 , 9 ]

    if (overlapping (list1, list2)):

    print ( "overlapping" )

    else :

    print ( " not overlapping " )

    Output:

     not overlapping 
  2. The operator not in — evaluates to true if it does not find a variable in the specified sequence, and false otherwise.

    # Python program for illustration
    # not in a statement

    x = 24

    y = 20

    list = [ 10 , 20 , 30 , 40 , 50 ]; 

     

    if (x not in list ):

    print " x is NOT present in given list "

    else :

    print "x is present in given list"

     

    if ( y in list ):

    print "y is present in given list"

    else :

    print " y is NOT present in given list "

  3. Identity Operators

    In Python, they are used to determine if a value is of a particular class or type. They are commonly used to determine the type of data that a particular variable contains. 
    There are different identification operators, such as

    1. Operator & # 39; is & # 39; — evaluates to true if the variables on either side of the operator point to the same object, and false otherwise.

      # Python program to illustrate usage
      # of & # 39; is & # 39; identity operator

      x = 5

      if ( type (x) is int ):

      print ( "true" )

      else :

      print ( "false" )

      Output:

       true 
    2. Not operator — evaluates to false if the variables on either side of the operator point to the same object and use otherwise.

      # Python program for illustration
      # using the identical is operator

      x = 5.2

      if ( type ( x) is not int ):

        print ( "true" )

      else :

      print ( " false " )

      Output:

       true 

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