Editing Python Examples

== Calculate the average of three numbers ==
 avg = (num1+num2+num3)/3

== Display a variable inside an f string and round it to only have 2 decimals, like with money. (the end result looks like this: <code>1000.00</code>) ==
 monthly_payment = 1000.0000
 print(f'The monthly payment is {monthly_payment:.2f}.')

== Display a large number and add commas in-between every 3 digits. (the end result looks like this: <code>1,000,000,000</code>) ==
 large_number = 1000000000
 print(f'{large_number:,}')

== Display a value using a minimum field width. This is useful for spacing in a cli or gui. (the end result looks like this: <code>The number is ________99</code>) ==
 number = 99
 print(f"The number is {number:10}")

== Align the text when a field width is specified. The <code><</code> can be substituted for a <code>></code> or <code>^</code> to align right or center respectively. ==
 number = 40
 print(f"{number:<10}")

== Usage of the walrus operator to shorten code ==
 # Without the walrus operator
 line = input("Enter a line (empty to quit): ")
 while line != "":
     print(f"You entered: {line}")
     line = input("Enter a line (empty to quit): ")
 
 # With the walrus operator
 while (line := input("Enter a line (empty to quit): ")) != "":
     print(f"You entered: {line}")

== Exiting a while loop with a <code>break</code> statement ==
 negativenumbers=0
 while True:
     number = input()
     if number == "stop":
         print(negativenumbers)
         break
     else:
         if int(number) < 0:
             negativenumbers+=1

== Use case for <code>pass</code> and <code>break</code> statement ==
 while True:
     table = int(input("Enter a number from 1 through 100: "))
     if (table > 100) or (table < 1):
         pass
     else:
         for number in range(1,11):
             print(f"{table} x {number} = {table*number}")
         break

== Use case for len() function inside of range() function to run code for every value in a list ==
 for i in range(len(items)):
     if items[i] < 0:
         items[i]=0

== Switch Statement in python (called a match case statement) ==
 lang = input("What's the programming language you want to learn? ")
 
 match lang:
     case "JavaScript":
         print("You can become a web developer.")
 
     case "Python":
         print("You can become a Data Scientist")
 
     case "PHP":
         print("You can become a backend developer")
 
     case "Solidity":
         print("You can become a Blockchain developer")
 
     case "Java":
         print("You can become a mobile app developer")
     case _:
         print("The language doesn't matter, what matters is solving problems.")

== List comprehension statement. Basically lets you do what you would with a for loop, but in less lines of code. ==
 plus_one = [i + 1 for i in my_list]