- it generates optimized bytecode (resulting in pyo files - do not run import site to look for python paths on startup - verbose output (detailed trace on import statements - disables class-based built-in exceptions (just use strings)obsolete starting with version - cmd runs python script sent in as cmd string file run python script from given file script from the command-line python script can be executed at the command line by invoking the interpreter on your applicationas in the following $python script py unix/linux orpythonscript py unix/linux orc>python script py windows/dos note be sure the file permission mode allows execution integrated development environment you can run python from graphical user interface (guienvironment as wellif you have gui application on your system that supports python unix idle is the very first unix ide for python