--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/python/readenv.py	Wed Feb 26 13:44:02 2014 -0800
@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+parse environment variables
+"""
+
+import argparse
+import os
+import subprocess
+import sys
+
+def parse_env(output):
+    return dict([line.split('=',1) for line in output.splitlines()])
+
+def read_env(script):
+    """read environment following source script"""
+    command = 'bash -c "(. {} &> /dev/null) && /usr/bin/env"'.format(script)
+    command = "(. {} &> /dev/null) && /usr/bin/env".format(script)
+    output = subprocess.check_output(command, shell=True, env={})
+    return parse_env(output)
+
+def diff_env(script):
+    before = parse_env(subprocess.check_output('/usr/bin/env', shell=True))
+    after = read_env(script)
+
+
+if __name__ == '__main__':
+    """test"""
+
+    import tempfile
+    from pprint import pprint
+
+    example = """export FOO=bar
+export FLEEM=foobar"""
+
+
+    fd, name = tempfile.mkstemp()
+    os.write(fd, example)
+    os.close(fd)
+    print (open(name).read())
+
+    pprint(name)
+    pprint(read_env(name))