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Identity operators

The identity operators in Python are used to determine whether a value is of a certain class or type. They are usually used to determine the type of data a certain variable contains. For example, you can combine the identity operators with the built-in type() function to ensure that you are working with the specific variable type.

Two identity operators are available in Python:

  • is – returns True if the type of the value in the right operand points to the same type in the left operand. For example, type(3) is int evaluates to True because 3 is indeed an integer number.
  • is not – returns True if the type of the value in the right operand points to a different type than the value in the left operand. For example, type(3) is not float evaluates to True because 3 is not a floating-point value.

Here are a couple of examples:

>>> x = 5
>>> type(x) is int
True
>>> type(x) is not float
True
>>> y = 3.23
>>> type(y) is not float
False
>>> type(y) is int
False

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