Expressions

• An expression is the combination of the operator and operands that is interpreted to produce some output value.

• + : Addition

• - : Substraction

• * : Multiplication

• / : Division

• ** : Power | Expectation

• % : Remainder

Operator Precedence Rules

Higher precedence rule to lowest precedence rule:

• Parentheses are always respected
• Exponentiation (raise to power)
• Multiplication, Division and Remainder
• Addition and Substraction
• Left to Right

Type of Variables

num = 123
print(num)
type(num)

num1 = 123.3
type(num1)

name = "John"
print(name)
type(name)

Type Conversions

• When you put an integer and floating point in an expression, the interger is implicitly converted to a float

print(float(99) + 100) #199.0
i = 42
type(i)

f = float(i)
print(f)
type(f)

Integer Division

print(10/2) #5.0
print(9/2) #4.5
print(99/100) #0.99
print(10.0/2.0) # 5.0
print(99.0/100.0) #0.99

String Conversions

• We can only use int() and float() to convert between string and integers.

str = "123"
type(str)

num = int(str)
type(num)
print(num)