cwd context manager

---

examples/advanced/mycwd.py

import os
from contextlib import contextmanager

@contextmanager
def cwd(path):
    oldpwd = os.getcwd()
    os.chdir(path)
    try:
        yield
    finally:
        os.chdir(oldpwd)

examples/advanced/context_cd.py

import sys
import os
from mycwd import cwd

def do_something(path):
    with cwd(path):
        content = os.listdir()
        if len(content) < 10:
            return

def main():
    if len(sys.argv) != 2:
        exit(f"Usage: {sys.argv[0]} PATH")
    path = sys.argv[1]
    print(os.getcwd())
    do_something(path)
    print(os.getcwd())

main()

$ python context_cd.py /tmp
/home/gabor/work/slides/python/examples/advanced
/home/gabor/work/slides/python/examples/advanced

$ python context_cd.py /opt
/home/gabor/work/slides/python/examples/advanced
/home/gabor/work/slides/python/examples/advanced