Os Process Cwd

In this tutorial, you'll learn about How to Fix Working Directory Errors. We cover key concepts, practical examples, and best practices.

Fix working directory errors when chdir in multi-threaded program changes CWD for all threads.

Quick Fix

Wrong

import os, threading
def worker():
    os.chdir('/tmp')
    print(f'CWD: {os.getcwd()}')
t=threading.Thread(target=worker)
t.start(); os.chdir('/home'); t.join()

Thread A changes CWD to /tmp. Thread B's CWD also changes. Race condition on shared CWD.

Right

import os, threading
os.chdir('/tmp')  # main thread
# Use absolute paths instead of relying on CWD
path=os.path.join(os.path.dirname(__file__),'data.txt')
# Or use pathlib:
from pathlib import Path
p=Path('/tmp')/ 'file.txt'
with open(p) as f: pass

Absolute paths avoid CWD dependency. Thread-safe. No shared mutable state.

Prevention

CWD is per-process, not per-thread. Use absolute paths in threaded code.

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