[Tutor] How to manipulate a user's input twice in one statement

[Alan Gauld]

On 16/05/2023 06:39, Goran Ikac wrote:
> If a value is assigned to the string some_string, this works:
>>>> some_string = 'avion'
>>>> some_string.removesuffix(input()[1:])
> ton
> 'avi'

It would help us understand what you are trying to do if you added
prompts to your input statements:

some_string = 'avion'
some_string.removesuffix(
     input("provide suffix with extra character at the front")[1:])


> But the next statement doesn't work as I've expected (it waits for another
> user's input):

Because you have two input statements. It will execute both of them.

>>>> input().removesuffix(input()[1:])
> avion
> ton
> 'avi'

Why do you want it all on one line? Normally you'd capture the two
things then process them:

some_string = input("String to process: ")
suffix = input("enter a suffix with an extra letter: ")
print(some_string.remove_suffix(suffix[1:])

Which is easier to read and debug and helps your user.

> Now, is there a way to manipulate the input from a user so to remove a
> slice from it, other than to assign that slice to a variable name and then
> to manipulate that variable?

You are not assigning a slice you are *applying* a slice to the string.
It's not clear why you are using a slice but that is not relevant.
The real question is why you want to do it all on one line?
There is no advantage and several disadvantages.

Remember the >>> prompt is not where your real programs will run,
that's just for experimenting and testing. The real code will run
using print statements etc. And you can place the input/output
exactly where you want it.

> I'd like to be able to put the user's input as an argument for a method
> that manipulates that same user's input. The method .removesuffix() is only
> an example.

Sorry, I'm still not clear what you really want to do.
Can you give us an example of a user session (without code for now)
Just show us the inputs and expected outputs?

-- 
Alan G
Author of the Learn to Program web site
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