Python 101 #3 - Memory management, Stack and Heap, Object Mutability

Python 101 is a beginner programming course designed to introduce you to Computer Science and Object-oriented programming.

In this video, we are going to define primitive data types in Python and learn how to declare variables.

[hieudoan]

This video is so underrated. Thanks for great explanation.

[alexa.]

great video just 1 small pedantic statement. id() returning the memory address of an object is an implementation detail in CPython. the only gaurentee is it returns a unique identifier, but it specifically being a memory address is not guaranteed by language specification

[mrboyban]

Great video! Clear and concise explanation. The fact you haven't added the cringe philosophical abstraction "BS", is much appreciated. Many thanks

[rihanentertainment]

I was stuck 3 days about this topic, but this tutorial helps me a lot <3
Very good explanation.

[colibri-ng]

Perfect explanation. Demystified how Python works behind! Thank you for the wonderful video.

[rajkaransinghgill]

At 4:29, how does python know the strings in both variables will be equal that they point to same location ? It looks like a = "Programming" and then b = a. In this scenario we create a pointer b pointing to same value as a. But please help me understand why it does the same in first scenario as well ?

[aronhegedus]

I would say that there's a caveat to the example @5.48, where 2 strings have the same id.

```
>>> s1 = "this is a sentence"
>>> s2 = "this is a sentence"
>>> id(s1)
4343023216
>>> id(s2)
4343022976
>>> s3 = "could_be_function_name"
>>> s4 = "could_be_function_name"
>>> id(s3)
4343022896
>>> id(s4)
4343022896
>>> s1 is s2
False
>>> s3 is s4
True
```

for the strings s3 and s4 both containing "could_be_function_name", Python applies an optimization called string interning.

Similarly with number from -5 to 255, the id-s are the same, but if you make a variable larger, it will have different id.

[sscapture]

Хороший видос! 4 года прошло... Поанируешь еще снимать? Было бы классно

[raynnaurd]

Thank you very much. Visualizing such logical terms which physically happens in the background that we can't see with our eyes, helps a lot. Good explanation.!!! fenx:)

[bharatirajanvss]

the variables that are defined (student_grade, student_integer_rep) are constants and should be stored in "DATA" segment of the memory right? HEAP should have dynamic variables afaik.

[izaak]

Thanks dude, i've been having some issues understanding this topic, however your explication is awesome, now I know how it works !

[giopez]

Hello, thanks for this video. I have been trying to get more info about heap and stack memory for Python, do you have some documentation or you just relate to Stack and Heap memory in C?

[ManiacViews]

This is very helpful, <3 thanks for the knowledge sharing

[LubulaChikwekwe]

This video explains it so simply and beautifully. One time i hard i understand wow

[micro_Dots]

it would be very helpful if you drop a link of next video

[AhmadShrif]

Very well explained, good job. It also worth mentioning that mutability is not transitive, for example: tuple_objoct = (1, [0, 2, 3], "qwe") if I try do this tuple_objoct[1][0] = 'd', what do you think will happen?

[nononnomonohjghdgdshrsrhsjgd]

and where is the name (word_1 or word_2) stored? As far as i understood, in Stack is stored the address of the value, i.e. the reference to the value. Where is the name of the variable stored? Thanks for the answer!

[shengzhibo]

There is an error in this video. id return the address for the object in heap or in stack, number = number +1 will not create a new address in stack, just repoint the to the new address in heap.

[johnrogers]

very helpful, many thanks - and good luck with your studies

[yathishprogramming]

Quality video sir, Easily Understable. thank you so much