Operators

Types of Operator

Python language supports the following types of operators.

• Arithmetic Operators (7)
• Comparison (Relational) Operators (7)
• Assignment Operators (8)
• Logical Operators (3)
• Bitwise Operators (6)
• Membership Operators (2)
• Identity Operators (2)

Identity vs Equality Operators

• Identity- Identity comparison with "is" and "is not"
• Equality- Equality comparisons with "==" and "!="

Arithmetic Operators (a = 10, b = 20)

Operator	Description	Example
+ Addition	Adds values on either side of the operator.	a + b = 30
- Subtraction	Subtracts right hand operand from left hand operand.	a -- b = -10
* Multiplication	Multiplies values on either side of the operator	a * b = 200
/ Integer Division	Divides left hand operand by right hand operand	b / a = 2
% Modulus	Divides left hand operand by right hand operand and returns remainder	b % a = 0
** Exponent	Performs exponential (power) calculation on operators	a**b =10 to the power 20
//	Floor Division - The division of operands where the result is the quotient in which the digits after the decimal point are removed. But if one of the operands is negative, the result is floored, i.e., rounded away from zero (towards negative infinity) −	9//2 = 4 and 9.0//2.0 = 4.0, -11//3 = -4, -11.0//3 = -4.0

Comparison (Relational) Operators (a = 10, b = 20)

Operator	Description	Example
==	If the values of two operands are equal, then the condition becomes true.	(a == b) is not true.
!=	If values of two operands are not equal, then condition becomes true.	(a != b) is true.
<>	If values of two operands are not equal, then condition becomes true. (Deprecated)	(a <> b) is true. This is similar to != operator.
>	If the value of left operand is greater than the value of right operand, then condition becomes true.	(a > b) is not true.
<	If the value of left operand is less than the value of right operand, then condition becomes true.	(a < b) is true.
>=	If the value of left operand is greater than or equal to the value of right operand, then condition becomes true.	(a >= b) is not true.
<=	If the value of left operand is less than or equal to the value of right operand, then condition becomes true.	(a <= b) is true.

Assignment Operators (a=10, b = 20)

The use of += like statements are called as accumulator pattern,

Like, sum = sum + value, This type of statements is called as accumulator pattern.

Operator	Description	Example
=	Assigns values from right side operands to left side operand	c = a + b assigns value of a + b into c
+= Add AND	It adds right operand to the left operand and assign the result to left operand	c += a is equivalent to c = c + a
-= Subtract AND	It subtracts right operand from the left operand and assign the result to left operand	c -= a is equivalent to c = c - a
*= Multiply AND	It multiplies right operand with the left operand and assign the result to left operand	c = a is equivalent to c = c a
/= Divide AND	It divides left operand with the right operand and assign the result to left operand	c /= a is equivalent to c = c / ac /= a is equivalent to c = c / a
%= Modulus AND	It takes modulus using two operands and assign the result to left operand	c %= a is equivalent to c = c % a
**= Exponent AND	Performs exponential (power) calculation on operators and assign value to the left operand	c = a is equivalent to c = c a
//= Floor Division	It performs floor division on operators and assign value to the left operand	c //= a is equivalent to c = c // a

Logical Operators (a = 10 and b = 20)

Operator	Description	Example
and Logical AND	If both the operands are true then condition becomes true.	(a and b) is true.
or Logical OR	If any of the two operands are non-zero then condition becomes true.	(a or b) is true.
not Logical NOT	Used to reverse the logical state of its operand.	Not(a and b) is false.

Bitwise Operators ( a = 60, b = 13)

a = 0011 1100

b = 0000 1101

Operator	Description	Example
& Binary AND	Operator copies a bit to the result if it exists in both operands	(a & b) (means 0000 1100)
`	Binary OR`	It copies a bit if it exists in either operand.
^ Binary XOR	It copies the bit if it is set in one operand but not both.	(a ^ b) = 49 (means 0011 0001)
~ Binary Ones Complement	It is unary and has the effect of 'flipping' bits.	(~a ) = -61 (means 1100 0011 in 2's complement form due to a signed binary number.
<< Binary Left Shift	The left operands value is moved left by the number of bits specified by the right operand.	a << 2 = 240 (means 1111 0000)
>> Binary Right Shift	The left operands value is moved right by the number of bits specified by the right operand.	a >> 2 = 15 (means 0000 1111)

Membership Operators

Operator	Description	Example
in	Evaluates to true if it finds a variable in the specified sequence and false otherwise.	x in y, here in results in a 1 if x is a member of sequence y.
not in	Evaluates to true if it does not finds a variable in the specified sequence and false otherwise.	x not in y, here not in results in a 1 if x is not a member of sequence y.

Identity Operators

Operator	Description	Example
is	Evaluates to true if the variables on either side of the operator point to the same object and false otherwise.	x is y, here is results in 1 if id(x) equals id(y).
is not	Evaluates to false if the variables on either side of the operator point to the same object and true otherwise.	x is not y, hereis not results in 1 if id(x) is not equal to id(y).

Python Operators Precedence

Sr.No.	Operator & Description
1	** Exponentiation (raise to the power)
2	~ + - Complement, unary plus and minus (method names for the last two are +@ and -@)
3	* / % // Multiply, divide, modulo and floor division
4	+ - Addition and subtraction
5	>> << Right and left bitwise shift
6	& Bitwise 'AND'
7	^ | Bitwise exclusive OR' and regularOR'
8	>= Comparison operators
9	<> == != Equality operators
10	= %= /= //= -= += *=**= Assignment operators
11	is is not Identity operators
12	in not in Membership operators
13	not or and Logical operators

Different ways to test multiple

# flags at once in Python
x, y, z = 0, 1, 0
if x == 1 or y == 1 or z == 1:
    print('passed')
if 1 in (x, y, z):
    print('passed')
# These only test for truthiness:
if x or y or z:
    print('passed')
if any((x, y, z)):
    print('passed')

Difference between is and ==

1. An is expression evaluates toTrueif two variables point to the same (identical) object.
2. An == expression evaluates toTrueif the objects referred to by the variables are equal (have the same contents).

Character Conversion

1. ord() convert character to ascii
2. chr() convert ascii to character

Swap Values

A = 23
B = 42
A, B = B, A

Conditional test with lists

• in
• not in

If statements

if age < 4:
    ticket_price = 0
elif age < 18:
    ticket_price = 10
else:
    ticket_price = 15