Passing a string to function in python [duplicate]

Question

I have next two functions:

    def encrypt(self, text):
        for i in range(len(text)):
            text = text[:i] + self.letters[self.letters.index(text[i]) + self.key] + text[i+1:]

    def decrypt(self, text):
        for i in range(len(text)):
            text = text[:i] + self.letters[self.letters.index(text[i]) - self.key] + text[i+1:]

I want them to act on strings in-place. What should I do?

Please edit and ask the question. Dont understand what you mean — Ekure Edem
– Ekure Edem, Commented Oct 18, 2020 at 18:38
You cannot change stringds in place - string are not mutable in python - you can only create a new string — Patrick Artner
– Patrick Artner, Commented Oct 18, 2020 at 18:40
@Ekure What don't you understand? I understand it perfectly well. Maybe you missed the last sentence? — wjandrea
– wjandrea, Commented Oct 18, 2020 at 18:40

Elidor00 · Accepted Answer · 2020-10-18 18:38:42Z

0

In Python, a string is immutable. You cannot overwrite the values of immutable objects. However, you can assign the variable again.

answered Oct 18, 2020 at 18:38

Elidor00

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3 Comments

silly_willy Over a year ago

But it's ineffective. There is something like passing by reference(c++) in python, isn't it?

wjandrea Over a year ago

@silly_willy Python doesn't support pass-by-reference.

Elidor00 Over a year ago

Arguments are passed by assignment. If you pass an immutable object to a method, you still can't rebind the outer reference, and you can't even mutate the object.

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