How to syntax highlight python scripts in PHP storm

There is no way to install Python plugin in PHPStorm.

Please use IntelliJ IDEA Ultimate to employ all languages (JavaScript, Java, PHP, Python, Ruby, Scala, etc.) support in one environment. If you don't want to try IDEA and only need a basic syntax highlighting for Python files in PHPStorm, you can either create a new file type in Settings/File Types, add *.py as registered pattern there, and define your own syntax highlighting rules, or search for existing textmate bundles for Python files in the web, import them and use for the *.py syntax highlighting - see TextMate Bundles in PhpStorm and SO discussion for more info.