How to Sync Two Directories in Python (rsync-like)

import os
import shutil
import sys
from pathlib import Path

def sync_dirs(src: Path, dst: Path):
    """Mirror src into dst: copy new files, overwrite changed, delete extras."""
    dst.mkdir(parents=True, exist_ok=True)
    for dst_entry in dst.rglob('*'):
        rel = dst_entry.relative_to(dst)
        src_entry = src / rel
        if not src_entry.exists():
            if dst_entry.is_dir():
                shutil.rmtree(dst_entry)
            else:
                dst_entry.unlink()
                print(f"Deleted: {rel}")
    for src_entry in src.rglob('*'):
        rel = src_entry.relative_to(src)
        dst_entry = dst / rel
        if src_entry.is_dir():
            dst_entry.mkdir(exist_ok=True)
        else:
            if not dst_entry.exists() or src_entry.stat().st_mtime != dst_entry.stat().st_mtime:
                dst_entry.parent.mkdir(parents=True, exist_ok=True)
                shutil.copy2(src_entry, dst_entry)
                print(f"Copied/Updated: {rel}")

if __name__ == "__main__":
    src_dir = Path("source_dir")
    dst_dir = Path("mirror_dir")
    src_dir.mkdir(exist_ok=True)
    (src_dir / "file1.txt").write_text("hello")
    (src_dir / "file2.txt").write_text("world")
    existing = dst_dir / "stale.txt"
    existing.parent.mkdir(exist_ok=True)
    existing.write_text("old")
    sync_dirs(src_dir, dst_dir)
    print("Destination contents:", sorted(p.name for p in dst_dir.iterdir()))
    shutil.rmtree(src_dir)
    shutil.rmtree(dst_dir)