Passing a string to function in python

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, Oct 18 '20 at 18:38
You cannot change stringds in place - string are not mutable in python - you can only create a new string — Patrick Artner, Oct 18 '20 at 18:40
@Ekure What don't you understand? I understand it perfectly well. Maybe you missed the last sentence? — wjandrea, Oct 18 '20 at 18:40

score 0 · Answer 1 · answered Oct 18 '20 at 18:38

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 '20 at 18:38

Elidor00

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But it's ineffective. There is something like passing by reference(c++) in python, isn't it? – silly_willy Oct 18 '20 at 18:41
@silly_willy [Python doesn't support pass-by-reference](https://stackoverflow.com/q/986006/4518341). – wjandrea Oct 18 '20 at 18:42
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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. – Elidor00 Oct 18 '20 at 18:42

Passing a string to function in python

1 Answers1