Python for Automation: Scripts Every Developer Should Have

import os
from pathlib import Path

def rename_files(directory: str, pattern: str, replacement: str):
    """Rename files matching a pattern."""
    path = Path(directory)
    renamed = 0

    for file in path.iterdir():
        if pattern in file.name:
            new_name = file.name.replace(pattern, replacement)
            file.rename(path / new_name)
            print(f"  {file.name} → {new_name}")
            renamed += 1

    print(f"\nRenamed {renamed} files.")

# Usage
rename_files("./images", "screenshot_", "blog-hero-")

import csv
import json
from pathlib import Path

def csv_to_json(csv_path: str, output_path: str | None = None):
    """Convert CSV to JSON with automatic type inference."""
    records = []

    with open(csv_path, 'r') as f:
        reader = csv.DictReader(f)
        for row in reader:
            # Try to convert numeric strings
            cleaned = {}
            for key, value in row.items():
                try:
                    cleaned[key] = int(value)
                except ValueError:
                    try:
                        cleaned[key] = float(value)
                    except ValueError:
                        cleaned[key] = value
            records.append(cleaned)

    out = output_path or csv_path.replace('.csv', '.json')
    Path(out).write_text(json.dumps(records, indent=2))
    print(f"Converted {len(records)} records → {out}")

csv_to_json("users.csv")

import urllib.request
import json
import time

ENDPOINTS = [
    ("Production API", "https://api.example.com/health"),
    ("Staging API", "https://staging.api.example.com/health"),
    ("Documentation", "https://docs.example.com"),
]

def check_health():
    print(f"Health check at {time.strftime('%H:%M:%S')}\n")

    for name, url in ENDPOINTS:
        try:
            start = time.time()
            req = urllib.request.urlopen(url, timeout=5)
            elapsed = (time.time() - start) * 1000
            status = "✅" if req.status == 200 else "⚠️"
            print(f"  {status} {name}: {req.status} ({elapsed:.0f}ms)")
        except Exception as e:
            print(f"  ❌ {name}: {e}")

check_health()

import subprocess
from collections import Counter
from datetime import datetime, timedelta

def git_stats(days: int = 30):
    """Show git contribution stats for the last N days."""
    since = (datetime.now() - timedelta(days=days)).strftime('%Y-%m-%d')

    result = subprocess.run(
        ['git', 'log', f'--since={since}', '--format=%an|||%s'],
        capture_output=True, text=True
    )

    authors = Counter()
    for line in result.stdout.strip().split('\n'):
        if '|||' in line:
            author, _ = line.split('|||', 1)
            authors[author.strip()] += 1

    print(f"Git contributions (last {days} days):\n")
    for author, count in authors.most_common():
        bar = "█" * min(count, 40)
        print(f"  {author:20s} {bar} {count}")

git_stats()