pass by value and reference in python

Показать описание

how to pass a variable by value and reference in python

easycoding

Рекомендации по теме

Комментарии

Python do not pass arguments by value: all by reference. But ... since python has two types of objects: immutable and mutable, here is what happens:

Immutable arguments are effectively passed by value: string, integer, tuple are all passed by reference. But since you can't change them in-place inside the function it looks as if it is passed by value.

Mutable arguments are effectively passed by reference: lists or dictionaries are passed by its pointers. Any in-place change inside the function like (append or del) will affect the original object.

easycoding

No dude. Python works differently than your old C and C++. By default, any kind of argument passed is taken by reference. Always. That's to save time from copying the data. The 'x' of your function (formal argument) is simply an alias that points to the same memory location as your original 'x' (actual argument). However, if you make changes to the formal argument variable, then that it starts pointing to a different location with that changed value. The only reason the list method is working is because of this fact only. Here, you're just telling Python to change the value at some index, not assign a totally new value to the variable. Hence, since it was passed by reference, and the change doesn't lead to pointing to a different memory, the change is reflected back in your actual argument as well.

comradepeter

😯😭😭thanks...i was in trouble... your explanation was awesome!! Actually got the concept

internetuser

Question: but in both scenarios, we are changing the variable we passed inside the function. Then why did the original value of x not change but the original value of a list changed. The code is exactly the same, except x was an integer data variable and a was a list. Sorry, im a bit confused :(

MridulaCh

You explained it wrong. Completely wrong python by default passes reference, you have to make it pass by value .

niteshraut

y pass by reference works on list but not on variables?

dharmendrapradhan

If you pass a list it is by default call by reference...

Nothing I have learned from your video..

sanjoy

isn't pass by reference vs value a property of the language? how can you have both

miguelpetrarca

thank you so much sir . pls keep making videos

harishsiddharth

Nice one bro . But improve your speaking!

naraendrareddy

bro you gotta speak up...But good explantion I guess

squad

pass by value and reference in python

C++ pass by VALUE vs pass by REFERENCE? 📧

C++ Pass by Value, Reference, Pointer Explained

Call By Value & Call By Reference in C

Java is ALWAYS Pass By Value. Here's Why

8.6: Pass by Value vs. Pass by Reference - Processing Tutorial

Pass by value and Pass by reference (Animated)

Reference Vs Value In JavaScript

Call by value and Call by reference in c with an example | Visualizing Pointers in C

Pass by Value vs. Pass by Reference

Should I pass by const reference or by value?

C++ Programming Tutorial 67 - Pass By Reference and Pass By Value

Passing by value vs reference EXPLAINED

Pass by Value vs. Pass by Reference | Python Course #12

SAP ABAP Objects - Pass by Reference vs. Pass by Value

Pass By Reference | C Programming Tutorial

C# Tutorial For Beginners - 14. Pass By Value VS. Pass By Reference

Java Programming Tutorial 80 - Passing by Value or Reference

JavaScript Pass by Value vs Pass by Reference | Mastering Advanced JavaScript Concepts

Java is pass/call by value or pass/call by reference [MOST IMP. JAVA INTERVIEW QUESTION]| ode Decode

Pass By Value and Pass By Reference In Java | Java Tutorials

Pass by value vs Pass by reference in c programming language

The Truth About Python's Pass By Reference vs. Pass By Value

C++ Functions Pass by Value or Reference

27 - Modularization Techniques - Subroutines Part6(Pass by Value and Pass by Reference)