Python Beginner: Building a Better Calculator

 Hello, developer!

Hope you are having confidence on Python programming! You can get input from user, printing out results with your data type, making lists & tuples, building functions and using if statements.

Today, we will build up a upgraded calculator. It supports add, subtract, multiplying and division of 2 input numbers.

I showed the better calculator codes and execution result as following.

num1 = float(input("Enter first number: "))
op = input("Enter operator: ")
num2 = float(input("Enter second number: "))

if op == "+":
    print(num1 + num2)
elif op == "-":
    print(num1 - num2)
elif op == "/":
    print(num1 / num2)
elif op == "*":
    print(num1 * num2)
else:
    print("Invalid operator")

Can you see the same result on your PC? Great job! I recommend you have some time to improve this calculator with more useful calculation features.

See you on the next post, developer! 😊

  

Python Beginner: If Statements & Comparisions

 Hello, developer!

Today, we will learn value comparison values in condition of "If Statements".

We can use  number value comparison as below.

Number Value Comparisons

value_1 == value_2 # value_1 and value_2 are same value

value_1 > value_2 # value_1 is greater than value_2

value_1 >=  value_2 # value_1 and value_2 are same or value_1 is greater than value_2

value_1 != value_2 # value_1 is not same value_2

We will use these comparisons in the condition of if statements.

I showed the "If Statements & Comparisons" exercise codes and execution result as following.

def max_num(num1, num2, num3):
    if num1 >= num2 and num1 >= num3:
        return num1
    elif num2 >= num1 and num2 >= num3:
        return num2
    else:
        return num3

print(max_num(300,4,5))

def max_num2(num1, num2, num3):
    if num1 == num2 and num1 != num3:
        return num1
    elif num1 != num2 and num2 == num3:
        return num2
    else:
        return num3

print(max_num2(5,10,15))

Can you see the same result on your PC? Great job! Now you can use number value comparisons in if statements.

See you on next post, developer! 😊

Python Beginner: If Statements

 Hello, Python developer!

Hope you handle values through functions.

Today, we will learn "If Statements". The "If statements" enables you to make decision through comparing conditions can be confirmed as True or False. It executes designated codes when the condition is True. We can program input value from user and check condition by input value and response by executing guided codes.

Here is an example the "If Statements" in our real life. We can assume a lot of decision making cases in life can be exchanged "if" & "otherwise" statements. 

I wake up 

if I'm hungry

    I eat breakfast

I leave my house

if it's cloudy

    I bring an umbrella

otherwise

    I bring sunglasses

I'm at a restaurant

if I want meat

    I order a steak

otherwise if I want pasta

    I order spagetti & meatballs

otherwise 

    I order a salad

I showed "If Statements" definition and examples.

If statements example

If condition(the result should be Boolean type(True or False))

    print("This is If Statements example!") # This line was indented

else:

    print("This is not If Statements example!") # This line was indented

If you make sub if statements in if statements, you can use "Else if" command as below.

Else If statements command

elif condition  # Should be located under If statement line without indent

In "If statements", you can use "And", "Or" and "Not" command for condition comparing as below.

Additional If Statements commands

if condition_1 and condition_2 # Execute indented codes in case, all condition_1 and condition_2 are "True"

if condition_1 or condition_2 # Execute indented codes in cases, all condition_1 and condition_2 are "True" or one of condition(condition_1 or condition_2) is "True" 

if not(condition_1) # Execute indented codes in case, condition_1 is "False"

if condition_1 and not(condition_2) (combination of condition commands) # Execute indented codes in cases, condition_1 is "True" and condition_2 is "False"

Is it clear for understanding "If statements commands"? If you're good, let's start coding!

I showed full exercise codes and execution result as following.

is_male = True
is_tall = False

if is_male and is_tall:
    print("You are a tall male.")
elif is_male and not(is_tall):
    print("You are a short male.")
elif not(is_male) and is_tall:
    print("You are not a male but are tall")
else:
    print("You are either not male or not tall or both.")

Can you see the same result? Great job! Now you can use if statements in Python programming!

See you on next post, Python developer! 😊