Python ctypes Tutorial - Using C/C++ Functions in Python

Python as a Programming Language is slower and less efficient in comparison to languages like C and C++. Writing certain parts of your code in C/C++ can significantly improve your performance. The ctypes library creates an interface which allows you to import C/C++ functions and execute them in Python.

C File Compilation Command:

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[yanglijian]

You have no idea how much i love your accent😄, please do more share, just free talk is great. I am your fans

[iancu_de_hunedoara]

after 2.5 hours of searching, I finally found adequate tutorial.

[MnemonicCarrier]

Nice quick how-to - very informative, thanks!

[malborboss]

Video is very informative although the way "Okay" keeps being repeated is a little bit iritating

[NickSBailey]

great this is exactly what I've been looking for and clearly explained

[Jayveersinh_Raj]

The reason why only J was printed and no john before converting into bytes is that when declared in the function as pointer, by default it only points to the 0th value, this is done for efficiency in c, hence, you do not pass entire array right away. You can increment the pointer and get the entire array (string "john") by incrementing pointer in the c function, that would be faster than converting it to bytes first.

[undeadpresident]

This was explained well. I got to try this. I've been wanting to become proficient in C and speed up the python program I'm working on, but don't have time to go full bore into rewriting the whole thing in C. Maybe I can do it piece by piece and see how it goes.

[bmbdjvw]

Well done. I have never seen videos like this. Thank you very much

[csdnil]

thanks this is what i wanted to learn because i use python libraries that use c libraries

[retrojames]

I write DLL's in Pascal. This has been useful to me thank you.

[haxidenti]

Would be good to see working with pointers and structure

[enrique]

hiii!! do you know how in python, load a Third part DLL, I´ve just only has documentation of the Methods of the DLL, but I do not Know what is inside. COuld you guide me? please

[MatthijsKoelewijn]

I got this error : OSError: [WinError 193] %1 is not a valid Win32 application
Can anyone help me out?

[AlekseyHmelevskoy]

function 'display' not found ((((

[ankidokolo]

Hi. Thank you for the tutorial. It was great. I am just trying to get a numerical result from function in c to my python code. If the number is big (thousands or millions) it cannot be displayed in the python output, although it works just fine in the c code. Is there any way to make python or ctypes show such numbers.

[tootyfruity]

I've copied your code up until 6:57 where I call clibrary's display function, but my thing wont run ;( It just says "AttributeError: function 'display' not found"--what do you think went wrong im sure ive done ive copied you correctly. My third line of code ran just fine

[RAGHAVJAIN-umou]

can someone please help me with this error, followed the tutorials but still getting this error, Traceback (most recent call last):
File "c:\Users\ragha\OneDrive\Desktop\test\main.py", line 2, in <module>
clibrary =

File "C:\Users\ragha\AppData\Local\Programs\Python\Python312\Lib\ctypes\__init__.py", line 460, in LoadLibrary
return self._dlltype(name)

File "C:\Users\ragha\AppData\Local\Programs\Python\Python312\Lib\ctypes\__init__.py", line 379, in __init__
self._handle = _dlopen(self._name, mode)

OSError: [WinError 193] %1 is not a valid Win32 application

[ScottKFraley]

So, `.so` works in Windows and isn't just a *nix thing? I always thought that it had to be `.dll` in/for Windows. (Course, for all I know, he may be running in some flavor of *nix. May have missed that part.)

[dapoint]

How to read complete string in python? You are returning it in C but not reading in python!

[maksimluzin]

Ok, ok, ok every five seconds! Pls, do not use the garbage words, it's annoying really!
P.S. The video, by the way, was useful...