I’m currently doing Dr. Charles Severence’s lessons on FreeCodeCamp to try to learn Python3. I’m on lesson exercise 02_03 and confused about multiplying floating-point and integer values.

The goal is to write a Python program multiplying hours worked by pay rate to come up with a pay quantity.

This is the code I wrote:

h = input("Enter hours: ")
r = input("Enter pay rate: ")
p = float(h) * r

I got a traceback error, and the video said the correct way to solve said error was change Line 3 from p = float(h) * r to p = float(h) * float(r).

However, what I’m confused about is why would I need to change r to a floating-point value when it’s already a floating-point value (since it’d be a currency value like 5.00 or something once I typed it in per the input() command*?

What am I missing here?

 

*I can’t remember: are the individual commands in a python line called “commands”?

 

 

Edit: Wrote plus signs in my post here instead of asterisks. Fixed.

 

EDIT: Thanks to @Labna@lemmy.world and @woop_woop@lemmy.world. I thought that the input() function was a string until the end-user types something in upon being prompted, and then becomes a floating-point value or integer value (or stays a string) according to what was typed.

This is incorrect: the value is a string regardless of what is typed unless it is then converted to another type.

  • woop_woop@lemmy.world
    4·
    4 months ago

    the signature for the input function (that’s what it’s called instead of command) is

    def input(__prompt: Any = ...) -> str

    which means it’s always going to return a string.

    So it starts off as a string, then becomes whatever is typed in

    there’s no real way for something to do that automatically without a much more robust setup.

    this snippet proves that

    test_int = input('enter integer:')
print(type(test_int))
test_float = input('enter float:')
print(type(test_float))
test_str = input('enter string:')
print(type(test_str))

>> <class 'str'>
>> <class 'str'>
>> <class 'str'>

    it is the responsibility of your program to validate and do whatever you want with the result, and part of that can include casting it to a different type.