Python is operator

Python is operator

• Python provided another important operator to the programmer.
• is Operator in python: To know the reference pointing to the same object.
• The syntax for is operator in python
  Oprand1 is oprand2
  is operator will return True is both references pointing to the same object, otherwise false.
• Example
  x = 10
  y = 10
  x is y => True
  y is x => True

  

  In the above example is operator gives result True as both references pointing to the same object.

How does it work? To know this read post Immutable concept in python

• This concept is known as object reusing in python.
• Reference comparison in python
• We perform python is operator by is operator.
• Consider another Example :
  x = 256
  y = 256
  x is y => True

  

  In above example is operator gives result True as both reference pointing to same object.

• Now see one more example as
  x = 257
  y = 257
  x is y => False

  

  In the above example is operator gives result False as both references pointing to different objects.
  Why?
  Because Reusing the same object such type of flexibility applicable to 0 to 256 only, because it is the most commonly used range for programming.

• Reusing the same object only in the following ranges
  int Data type => 0 to 256
  Boolean Data type => Always reuse same object ( 2 objects)
  String Data type => Always reuse the same object ( 2 objects)
  Float Data type => Always new object created.
  Complex Data type => Always new object created.
• For floating point, Data type reusing concept is not applicable.
  Example
  x = 10.0
  y = 10.0
  x is y => False
• For Complex Data type reusing concept is not applicable.
  Example
  x = 10 + 1j
  y = 10 + 1j
  x is y => False
• Note : is operator in python used for refernce comparison within applicable ranges.