Filter PATH in windows

filter_path.py

#!/usr/bin/env python
from __future__ import print_function
import os

# Original PATH
original_path = os.environ['PATH']
print('*'*80)
print('Your current PATH:')
print(original_path)

# Filter PATH
print('*'*80)
print('Filtering PATH...')
new_path = []
for p in original_path.split(';'):
    if not os.path.isdir(p):
        print('{} no longer exits'.format(p))
    else:
        if p in new_path:
            print('{} was repeated'.format(p))
        else:
            new_path.append(p)

# Filtered PATH
print('*'*80)
print('New PATH:')
print(';'.join(p for p in new_path) + ';')