python implementation replacing "call vsvars32.bat"

setupVSEnv.py

import os
import subprocess as sub


def vs_env_dict(vsver):
    cmd = r'cmd /s /c ""%VS{0}COMNTOOLS%vsvars32.bat" & set"'.format(vsver)
    output = sub.Popen(cmd, stdout=sub.PIPE, stderr=sub.STDOUT, stdin=sub.PIPE).communicate()[0].split(os.linesep)

    return dict((e[0].upper(), e[1]) for e in [p.rstrip().split("=", 1) for p in output] if len(e) == 2)

#VS2010=100, VS2012=110, VS2013=120, VS2015=140
os.environ.update(vs_env_dict(100))