Variables and Operators

Variables

Variables are reserved memory locations used to store values. The = sign assigns values to variables.

counter = 100        # integer
miles = 1000.0       # floating point
name = "John"        # string

Python has the following standard data types:

• Numbers

• String

• List

• Tuple

• Dictionary

Operators

Arithmetic Operators

Operator	Description	Example (a=7, b=3)
+	Addition	a + b → 10
-	Subtraction	a - b → 4
*	Multiplication	a * b → 21
/	Division	a / b → 2.333…
%	Modulus (remainder)	a % b → 1
**	Exponent	a ** b → 343
//	Floor division	7.0 // 3 → 2.0

Comparison Operators

Operator	Description	Example (a=7, b=3)
==	Equal to	a == b → False
!=	Not equal to	a != b → True
>	Greater than	a > b → True
<	Less than	a < b → False
>=	Greater than or equal to	a >= b → True
<=	Less than or equal to	a <= b → False

Note

The <> operator from Python 2 has been removed. Use != instead.

Assignment Operators

Operator	Description	Example
=	Assign	c = a + b
+=	Add and assign	c += a is equivalent to c = c + a
-=	Subtract and assign	c -= a is equivalent to c = c - a
*=	Multiply and assign	c *= a is equivalent to c = c * a
/=	Divide and assign	c /= a is equivalent to c = c / a
%=	Modulus and assign	c %= a is equivalent to c = c % a
**=	Exponent and assign	c **= a is equivalent to c = c ** a
//=	Floor divide and assign	c //= a is equivalent to c = c // a

Logical Operators

Operator	Description	Example
and	True if both operands are true	(a and b) is True
or	True if at least one operand is true	(a or b) is True
not	Reverses the logical state	not (a and b) is False