try:

import idlelib.PyShell

except ImportError:

# IDLE is not installed, but maybe PyShell is on sys.path:

try:

import PyShell

except ImportError:

raise

else:

import os

idledir = os.path.dirname(os.path.abspath(PyShell.__file__))

if idledir != os.getcwd():

# We're not in the IDLE directory, help the subprocess find run.py

pypath = os.environ.get('PYTHONPATH', '')

if pypath:

os.environ['PYTHONPATH'] = pypath + ':' + idledir

else:

os.environ['PYTHONPATH'] = idledir

PyShell.main()

else:

idlelib.PyShell.main()