Loop through all files in a directory?

[DeaD_EyE]

TypeHints are not required, but they help the developers of libraries to communicate what a method/function is expecting and what it should return.

What I don't like with the pathlib solution is the call to .is_file() for every path, which does a system call while os.walk() produces the list of files with internal mechanism. This needs to be checked but I suspect that os.walk() does less system calls.

It does lesser calls and is faster.

Output:
public@ganymed:~$ for script in walk?.py; do echo -n "$script: "; strace -e newfstatat python3 $script 2>&1 | wc -l; done
walk1.py: 27556
walk2.py: 129893
walk3.py: 11484

Output:
public@ganymed:~$ for script in walk?.py; do echo -n "$script: "; time python3 $script; echo ; done
walk1.py:
real    0m0,351s
user    0m0,192s
sys     0m0,160s

walk2.py:
real    0m1,208s
user    0m0,883s
sys     0m0,325s

walk3.py:
real    0m0,285s
user    0m0,179s
sys     0m0,106s

pathlib.Path.walk were added since Python 3.12: https://docs.python.org/3/library/pathli....Path.walk
This is similar to os.walk, but has some differences with the handling of symlinks.

The last example uses

Output:
Path.walk()

walk1.py

import os


for root, dirs, files in os.walk("/usr"):
    for file in files:
         ...

walk2.py

from pathlib import Path


for element in Path("/usr").rglob("*"):
    element.is_file()

walk3.py

from pathlib import Path


for root, dirs, files in Path("/usr").walk():
    for file in files:
        pass