perl - python override environment variable in local scope -

how can override environment variable in local scope? know how in perl, not python.

in perl:

if (1) {     local $env{path} = "/usr/bin:/bin:/usr/sbin:/sbin";     print "$env{path}\n"; } print "$env{path}\n"; 

the output be:

/usr/bin:/bin:/usr/sbin:/sbin /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin 

any idea how same in python?

well, 1 way save environment variable before scope starts , retrieve when ends. wonder if there nicer way that.

using python's with statement:

from sys import argv import os  class mypath(object):     def __init__(self, newpath):         self.newpath = newpath      def __enter__(self):         self.path = os.environ['path']         os.environ['path'] = self.newpath         return self.newpath      def __exit__(self, type, value, traceback):         os.environ['path'] = self.path  if __name__ == "__main__":     if len(argv) < 2:         print "usage: %s path" % (argv[0],)         exit(1)     print os.environ['path']      mypath(argv[1]) newpath:         print newpath         print os.environ['path']      print os.environ['path'] 

python path.py whatever

produces:

/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games whatever whatever /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games