title: ImportError: cannot import name 'IntEnum'
body: <p>I am trying to install <code>upstox</code>, which is a Python API for connecting to market data. I am unable to install it on Python3.5.</p>
  
  <p>My config is 
  <code>Python 3.5.3 (v3.5.3:1880cb95a742, Jan 16 2017, 15:51:26) [MSC v.1900 32 bit (Intel)] on win32</code>. And the error I keep getting is:</p>
  
  <pre><code>Collecting upstox
    Using cached upstox-0.7-py2.py3-none-any.whl
  Collecting future (from upstox)
    Using cached future-0.16.0.tar.gz
  Collecting websocket-client (from upstox)
    Using cached websocket_client-0.42.1-py2.py3-none-any.whl
  Collecting pycurl (from upstox)
    Using cached pycurl-7.43.0-cp35-none-win32.whl
  Collecting enum (from upstox)
    Using cached enum-0.4.6.tar.gz
      Complete output from command python setup.py egg_info:
      Traceback (most recent call last):
        File "&lt;string&gt;", line 1, in &lt;module&gt;
        File "C:\Users\UserPad\AppData\Local\Programs\Python\Python35-32\lib\site-packages\setuptools\__init__.py", line 10, in &lt;module&gt;
          from setuptools.extern.six.moves import filter, filterfalse, map
        File "C:\Users\UserPad\AppData\Local\Programs\Python\Python35-32\lib\site-packages\setuptools\extern\__init__.py", line 1, in &lt;module&gt;
          from pkg_resources.extern import VendorImporter
        File "C:\Users\UserPad\AppData\Local\Programs\Python\Python35-32\lib\site-packages\pkg_resources\__init__.py", line 33, in &lt;module&gt;
          import platform
        File "C:\Users\UserPad\AppData\Local\Programs\Python\Python35-32\lib\platform.py", line 117, in &lt;module&gt;
          import sys, os, re, subprocess
        File "C:\Users\UserPad\AppData\Local\Programs\Python\Python35-32\lib\subprocess.py", line 50, in &lt;module&gt;
          import signal
        File "C:\Users\UserPad\AppData\Local\Programs\Python\Python35-32\lib\signal.py", line 4, in &lt;module&gt;
          from enum import IntEnum as _IntEnum
      ImportError: cannot import name 'IntEnum'
  
      ----------------------------------------
  
  Command "python setup.py egg_info" failed with error code 1 in C:\Users\UserPad\AppData\Local\Temp\pycharm-packaging\enum\
  </code></pre>