Python : Operators

 In this tutorial we will study about ….

• What is operators ?
• Syntax of operators.
• How to use operators.

Operators are special symbols in Python that carry out arithmetic or logical computation. The value that the operator operates on is called the operand.

For example : 

>> 5 + 7

12

Here, 

+ is the operator that performs addition. 

5 and 7 are the operands and 12 is the output of the operation.

Type of operator

• Arithmetic operators
• Comparison operators
• Logical operators
• Bitwise operators
• Assignment operators
• Special operators
• Identity operators
• Membership operators

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Arithmetic operators

Arithmetic operators are used to perform mathematical operations like addition, subtraction, multiplication, etc.

Operator	Meaning	Example
+	Add two operands or unary plus	x+y+2
-	Subtract right operand from the left or unary minus	x-y-2
*	Multiply two operands	x*y
/	Divide left operand by the right one (always results into float)	x/y
%	Modulus - remainder of the division of left operand by the right	x % y  (remainder of x/y)
//	Floor division - division that results into whole number adjusted to the left in the number line	x // y
**	Exponent - left operand raised to the power of right	x**y (x to the power y)

Sample Program : Arithmetic operators in Python

PROGRAM

x = 15 y = 4 # To take inputs from the user #x = input('Enter value of x: ') #y = input('Enter value of y: ') # Output: x + y = 19 print('x + y =',x+y) # Output: x - y = 11 print('x - y =',x-y) # Output: x * y = 60 print('x * y =',x*y) # Output: x / y = 3.75 print('x / y =',x/y) # Output: x // y = 3 print('x // y =',x//y) # Output: x ** y = 50625 print('x ** y =',x**y)

OUTPUT

x + y = 19 x - y = 11 x * y = 60 x / y = 3.75 x // y = 3 x ** y = 50625

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Comparison operators

Comparison operators are used to compare values. It returns either True or False according to the condition.

Operator	Meaning	Example
>	Greater than - True if left operand is greater than the right	x > y
<	Less than - True if left operand is less than the right	x < y
==	Equal to - True if both operands are equal	x == y
!=	Not equal to - True if operands are not equal	x != y
>=	Greater than or equal to - True if left operand is greater than or equal to the right	x >= y
<=	Less than or equal to - True if left operand is less than or equal to the right	x <= y

Sample Program : Comparison operators in Python

PROGRAM

x = 10 y = 12 # To take inputs from the user #x = input('Enter value of x: ') #y = input('Enter value of y: ') # Output: x > y is False print('x > y is',x>y) # Output: x < y is True print('x < y is',x<y) # Output: x == y is False print('x == y is',x==y) # Output: x != y is True print('x != y is',x!=y) # Output: x >= y is False print('x >= y is',x>=y) # Output: x <= y is True print('x <= y is',x<=y)

OUTPUT

x > y is False x < y is True x == y is False x != y is True x >= y is False x <= y is True

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Logical operators

Logical operators are the and, or, not operators.

Operator	Meaning	Example
and	True if both the operands are true.	x and y
or	True if either of the operands is true.	x or y
not	True if operand is false (complements the operand)	x not y

Sample Program : Logical Operators in Python

PROGRAM

x = True y = False print('x and y is',x and y) print('x or y is',x or y) print('not x is',not x)

OUTPUT

x and y is False x or y is True not x is False

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Bitwise operators

Bitwise operators act on operands as if they were strings of binary digits. They operate bit by bit, hence the name.

For example, 2 is 10 in binary and 7 is 111.

In the table below: 

        Let x = 10 (0000 1010 in binary) and y = 4 (0000 0100 in binary)

Operator	Meaning	Example
&	Bitwise AND	x & y = 0 (0000 0000)
|	Bitwise OR	x | y = 14 (0000 1110)
~	Bitwise NOT	~x = -11 (1111 0101)
^	Bitwise XOR	x ^ y = 14 (0000 1110)
>>	Bitwise right shift	x >> 2 = 2 (0000 0010)
<<	Bitwise left shift	x << 2 = 40 (0010 1000)

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Assignment operators

Assignment operators are used in Python to assign values to variables.

a = 5 is a simple assignment operator that assigns the value 5 on the right to the variable a on the left.

There are various compound operators in Python like a += 5 that adds to the variable and later assigns the same. It is equivalent to a = a + 5.

Operator	Meaning	Example
=	x = 5	x = 5
+=	x += 5	x = x + 5
- =	x -= 5	x = x - 5
*=	x *= 5	x = x * 5
/=	x /= 5	x = x / 5
%=	x %= 5	x = x % 5
//=	x //= 5	x = x // 5
**=	x **= 5	x = x ** 5
&=	x &= 5	x = x & 5
|=	x |= 5	x = x | 5
^=	x ^= 5	x = x ^ 5
>>=	x >>= 5	x = x >> 5
<<=	x <<= 5	x = x << 5

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Special operators

Python language offers some special types of operators like the identity operator or the membership operator.

Identity operators

is and is not are the identity operators in Python. They are used to check if two values (or variables) are located on the same part of the memory. Two variables that are equal does not imply that they are identical.

Operator	Meaning	Example
is	True if the operands are identical (refer to the same object)	x is True
is not	True if the operands are not identical (do not refer to the same object)	x is not True

Sample Program : Identity operators in Python

PROGRAM

x1 = 5 y1 = 5 x2 = 'Hello' y2 = 'Hello' x3 = [1,2,3] y3 = [1,2,3] # Output: False print(x1 is not y1) # Output: True print(x2 is y2) # Output: False print(x3 is y3)

OUTPUT

False True False

Here, we see that x1 and y1 are integers of the same values, so they are equal as well as identical. Same is the case with x2 and y2 (strings).

But x3 and y3 are lists. They are equal but not identical. It is because the interpreter locates them separately in memory although they are equal.

Membership operators

in and not in are the membership operators in Python. They are used to test whether a value or variable is found in a sequence (string, list, tuple, set and dictionary).

In a dictionary we can only test for presence of key, not the value.

Operator	Meaning	Example
in	True if value/variable is found in the sequence	5 in x
not in	True if value/variable is not found in the sequence	5 not in x

Sample Program : Membership operators in Python

PROGRAM

x = 'Hello world' y = {1:'a',2:'b'} # Output: True print('H' in x) # Output: True print('hello' not in x) # Output: True print(1 in y) # Output: False print('a' in y)

OUTPUT

True True True False

Here, 'H' is in x but 'hello' is not present in x (remember, Python is case sensitive). Similarly, 1 is key and 'a' is the value in dictionary y. Hence, 'a' in y returns False.

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