Notes - Wednesday 1/6/21 - Backup of the Temperature Converter Code

1/6/21: My first Python Code. It converts temperatures from F to C and C to F.

Huge thanks for @Tokugero and @Leeoku for helping me. And Girlshark for the inspiration

Code with comments

# Instantiate initial true flag to enter loop
run_loop = True
# Set global variable to count
retry = 0
# Runs code while retry is under 3
while retry < 3:

    # While set to go
    while run_loop:
        # Try to capture a float at input time so we don't have to parse it later
        try:
            temp = (float(input("Enter temperature = ")))
        except Exception:
            # Exception catches all errors
            # more info here: https://docs.python.org/3/library/exceptions.html
            print("Input isn't a temperature; try again. Max 3 attempts. Attempts:",retry+1)
            retry += 1
            # If we can't establish a float for the first input, we'll simply skip the rest of this iteration and never set
            # the run_loop flag to false, allowing loop to continue
            # Print is setup so it tells me how many attempts I'm at and shows the count
            break
            # Ends the program if I guess too much

        # Instantiate a sub loop
        run_loop_sub = True

        while run_loop_sub:
            try:
                unit = str(input("Enter C or F (for Celsius or Farhenheit) = "))
            except Exception:
                print("Input needs to be c/C or f/F")
                # Harder to hit this since "" is a string in input, but if it fails for whatever reason 
                # just try again
                continue

            if unit.lower() == "c":
                fahrenheit = (temp * 9/5) + 32
                print(f'{round(fahrenheit,2)} F')
                print('You know the temp now!')
                # Completion condition met, set loop flag to false to exit loop after this iteration
                run_loop_sub = False

            elif unit.lower() == "f":
                celsius = (temp - 32) * 5/9
                print(f'{round(celsius,2)} C')
                print('You know the temp now!')
                # Completion condition met, set loop flag to false to exit loop after this iteration
                run_loop_sub= False

            else:
                print("You need to enter either c/C or f/F")
                # There is no satisfactory completion here, so don't set the close flag

            # If we make it here, that means that the sub while loop was satisfied, and there is no further exceptions to
            # skip this flag; we can probably end the loop
            run_loop = False
            
    #if retry == 3:
    #    run_loop = False
        # Not sure if this helps or hurts
        # After experimenting, it doesn't seem to matter if it's here

Code without comments

run_loop = True
retry = 0
while retry < 3:

    while run_loop:
        try:
            temp = (float(input("Enter temperature = ")))
        except Exception:
            print("Input isn't a temperature; try again. Max 3 attempts. Attempts:",retry+1)
            retry += 1
            break

        run_loop_sub = True

        while run_loop_sub:
            try:
                unit = str(input("Enter C or F (for Celsius or Farhenheit) = "))
            except Exception:
                print("Input needs to be c/C or f/F")
                continue

            if unit.lower() == "c":
                fahrenheit = (temp * 9/5) + 32
                print(f'{round(fahrenheit,2)} F')
                print('You know the temp now!')
                run_loop_sub = False
                

            elif unit.lower() == "f":
                celsius = (temp - 32) * 5/9
                print(f'{round(celsius,2)} C')
                print('You know the temp now!')
                run_loop_sub= False

            else:
                print("You need to enter either c/C or f/F")
            run_loop = False