Basic_Math.py

# Built in print() function used to output results on terminal
# Each learning point is contained within a function that describes the code
# The # and """" syntax is used for single and multiline comments explaining the code

# Basic Math Operators
# + addition
# - subtraction
# * multiplication
# / division (with decimals/float)
# // division (without decimals/integer)
# ** Exponents
# % modulo operator - returns the remainder after division.


# Addition

def Addition():
    print(4 + 5)


def Add_Variables():
    First_Number = 4
    Second_Number = 20
    print(First_Number + Second_Number)


def Add_Strings():
    print("first" + " " + "second")


def Add_Variables_Containing_Strings():
    Var1 = "First string"
    Var2 = "Second String"
    print(Var1 + " " + Var2)


def Add_Lists():
    list1 = [1, 2]
    list2 = [3, 4]
    print(list1 + list2)


def Add_Values_Returned_From_Function():
    def get_num():
        return 5
    print(get_num() + 10)


def Add_And_Reassign():
    Var1 = 20
    print(Var1)
    Var1 += 15
    print(Var1)


# Subtraction

def Subtraction():
    print(20 - 7)
    print(20 - 100)


def Subtract_Floats():
    print(3.5 - 7.5)


def subtract_variables():
    Var1 = 26
    Var2 = 12
    print(Var1 - Var2)


def Subtract_And_Reassign():
    Var1 = 10
    print(Var1)
    Var1 -= 5
    print(Var1)


def Chaining_Subtraction():
    print(10 - 5 - 2)


def Subtract_In_For_Loop():
    """Built in Range function has 3 arguments (Start, Stop, Step)
    Step means would you like to count up or down 1 at
    a time or 2 or more. The stop number will not be 
    returned, the number before it will. The start number
    is returned."""
    for i in range(10, -1, -1):  # in a range from 10 to -1,decrementing from 10 for each number in that range print it
        print(i)


def Subtract_In_While_Loop():
    """As long as Var1 is greater than or equal to
    0, print Var1, subtract 1 and reassign that difference
    to Var1"""
    Var1 = 10
    while Var1 >= 0:
        print(Var1)
        Var1 -= 1


def Subtract_With_Lists():
    """Print Var1 and then for each item in List1, subtract
    it from Var1, reassign the difference to Var1"""
    Var1 = 100
    List1 = [10, 20, 10, 3, 6]
    for number in List1:
        print(Var1)
        Var1 -= number


# Multiplication

def Multiplication():
    print(5 * 5)


def Multiply_With_Float():
    print(8.9 * 7)


def Multiply_Variables():
    Var1 = 3
    Var2 = 7
    print(Var1 * Var2)


def Multiply_And_Reassign():
    Var1 = 8
    print(Var1)
    Var1 *= 7
    print(Var1)


def Multiply_Strings():
    String = "This is a string "
    print(String)
    String *= 3
    print(String)
    print("*" * 30)


def Multiply_In_Lists():
    List1 = [1, 2]
    print(List1 * 6)


def Multiply_In_For_Loop():
    """Note how the stop argument is 21 instead of 20. I want to see the
    product of 20 x 3, but the stop argument does not print so i must use
    the next number up. Also notice how i used an f-string, look at Strings.py
    for info on f-strings"""
    for i in range(0, 21):
        print(f"{i} x 3 is {i * 3}")


def Multiply_For_Loop_With_String():
    for i in range(1, 10, 1):
        print("*" * i)


def Multiply_In_While_Loop():
    """I want to multiply Var1 by 2, reassign that product to Var1 and print it, 
    however i do not want it to go higher than 10. I use a conditional `if` 
    statement and a loop control keywork `break` to prevent printing
    a number higher than 10"""
    Var1 = 1
    while Var1 < 10:
        Var1 *= 2
        if Var1 > 10:
            break
        print(Var1)


# Division