if else

if

if condition:
    statement

the code(statement) will only be executed if the condition is true

age = int(input("your age? "))
    # your age? 10

if age < 12:
    print("you are under 12")
        # you are under 12

if & else

age =int(input("what is your age? "))

if age < 4:
    print("film is to complicated for you")
else:
    if age < 12:
        print("have fun!")
    else:
        if age < 16:
            print("are you sure?")
        else:
            print("really?!?!?!?!???")

elif

age =int(input("what is your age? "))

if age < 4:
    print("film is to complicated for you")
elif age < 12:
    print("have fun!")
elif age < 16:
    print("are you sure?")
else:
    print("really?!?!?!?!???")

comparison operators

operator
x == y	Equals
x != y	Not Equals
x < y	Less than
x <= y	Less than or equal to
x > y	Greater than
x >= y	Greater than or equal to

True and False

python considers everything that is not equal to false as true but what is false?

• numeric null values (0, 0L, 0.0...)
• the boolean value False
• empty strings
• empty lists/tuples
• empty dictionaries
• and the value None

Compound Condition

you can also use "and", "or", "not" example:

a = 42
20 < a and a < 100
    # True

b = 123
20 < b and b < 100
    # False