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Ever suspect something’s messing with your files?
Let’s catch it in the act—with Python.

Today, we're building a Spy Folder—a Python script that watches a folder and tells you if anything changes: new files, renamed files, deleted files, or anything shady.

Perfect for:

  • Tracking shared project folders
  • Catching sneaky background apps
  • Debugging random disappearing files
  • Or just flexing your Python muscles in a fun way

Let’s build it in less than 30 lines.

🧰 What You’ll Learn

This isn’t just a “fun with files” kind of script. You’ll learn how to:

  • Use os and time to check files
  • Take folder “snapshots”
  • Compare snapshots to detect file changes
  • Print detailed updates in real-time

No frameworks. Just raw Python and a curious mind.

⚙️ Step 1: Let’s Install Nothing

No pip installs here. We’re using just the standard library.

👁️ Step 2: Spy Script Code

Here’s the whole script. Save it as spy_folder.py:

import os
import time

WATCHED_FOLDER = "./watched"  # Change this to your folder path

def snapshot(folder):
    return {f: os.path.getmtime(os.path.join(folder, f)) for f in os.listdir(folder)}

print(f"👀 Watching: {WATCHED_FOLDER}")
before = snapshot(WATCHED_FOLDER)

while True:
    time.sleep(2)
    after = snapshot(WATCHED_FOLDER)

    added = set(after.keys()) - set(before.keys())
    removed = set(before.keys()) - set(after.keys())
    modified = {f for f in after if f in before and after[f] != before[f]}

    for f in added:
        print(f"[+] File added: {f}")
    for f in removed:
        print(f"[-] File removed: {f}")
    for f in modified:
        print(f"[~] File modified: {f}")

    before = after

💡 How It Works

We take a “snapshot” of the folder using the file names and their last modified times. Every 2 seconds, we take a new snapshot and compare it to the last one:

  • If there’s a new file → we log it
  • If a file disappeared → we scream inside
  • If the modified time changed → we note that too

This thing is simple but weirdly addictive to watch.

🔒 Where It Gets Cool

You can:

  • Turn this into a system tray app
  • Log everything to a file
  • Trigger an alert if a sensitive file changes
  • Extend it to monitor multiple folders

For example, you can add subprocess to run a script when a file is added. Or tie it to a Git commit hook.

🧠 Want More Stuff Like This?

If quirky tools like this tickle your Python brain, I highly recommend checking out this Python hub I’ve been using:

Bookmark it: python.0x3d.site
It’s become my “daily scroll” when I want Python ideas that actually matter.

🚨 Final Thoughts

The point of projects like this isn’t to show off—it’s to learn by solving weird problems. You sharpen your tools, pick up new tricks, and maybe even build something you end up using every day.

This Spy Folder script might look small… but it’s your first step into building watchdogs, file trackers, even real-time sync tools.

So—go spy on your folders.
They've probably been up to something.

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