First commit

README.md

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+
+Guetzli is a Google program to optimize JPEG images. Unfortunately, it only works one file at a time. With this script in Python you can do it recursively a whole folder.
+
+# Install 
+
+Guetzli must be installed on your system. Follow the official instructions.
+[Guetzli](https://github.com/google/guetzli)
+
+and Python 3.
+
+# Use
+
+```bash
+python guetzli-recursively.py [folder]
+```
+
+Example
+
+```bash
+python guetzli-recursively.py img
+```
+

guetzli-recursively.py

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+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+from os import path, walk, remove, rename
+from subprocess import call
+from sys import argv
+top_dir = argv[1]
+TEMP_FILE = 'temp.jpg'
+extensions = ('jpeg', 'jpg')
+
+for dirpath, dirnames, files in walk(top_dir):
+    for name in files:
+        for extension in extensions:
+            if name.lower().endswith(extension):
+                # Get urls
+                url = path.join(dirpath, name)
+                print(url)
+                url_out = path.join(top_dir, TEMP_FILE)
+                # Remove temp image
+                try:
+                    remove(url_out)
+                except:
+                    pass
+                # Execute guetzli
+                call(['guetzli', url, url_out])
+                # Print your have saved
+                size_source = path.getsize(url)
+                try:
+                    size_out = path.getsize(url_out)
+                except:
+                    size_out = size_source
+                size_acurate = 100 * size_out / size_source
+                # Remove source
+                try:
+                    remove(url)
+                except:
+                    pass
+                if size_acurate < 100:
+                    # Move temp to source
+                    rename(url_out, url)
+                    print('Save ' + str(100 - size_acurate) + '%')
+                else:
+                    print('It is not necessary to optimize')