title: Google cloud sdk not working when python points python3
body: <p>I am currently trying to install google cloud sdk on my macbook. I am using scikit-learn and anaconda for machine learning so on my laptop python points to python3.5. However google cloud sdk requires python 2.7 for installation, and that's why I am facing the problem of not be able to install it.</p>
  
  <p>when I ran the install.sh file the error occurred and I have no clue how to deal with it:</p>
  
  <pre><code>Adam | ~ $ git/google-cloud-sdk/install.sh
  Welcome to the Google Cloud SDK!
  Traceback (most recent call last):
    File "/Users/AdamLiu/Git/google-cloud-sdk/lib/third_party/enum/__init__.py", line 364, in __getattr__
      return cls._member_map_[name]
  KeyError: '_convert'
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "/Users/AdamLiu/git/google-cloud-sdk/bin/bootstrapping/install.py", line 8, in &lt;module&gt;
      import bootstrapping
    File "/Users/AdamLiu/Git/google-cloud-sdk/bin/bootstrapping/bootstrapping.py", line 9, in &lt;module&gt;
      import setup
    File "/Users/AdamLiu/Git/google-cloud-sdk/bin/bootstrapping/setup.py", line 34, in &lt;module&gt;
      from googlecloudsdk.core.util import platforms
    File "/Users/AdamLiu/Git/google-cloud-sdk/lib/googlecloudsdk/core/util/platforms.py", line 18, in &lt;module&gt;
      import platform
    File "/Users/AdamLiu/anaconda/lib/python3.5/platform.py", line 117, in &lt;module&gt;
      import sys, os, re, subprocess
    File "/Users/AdamLiu/anaconda/lib/python3.5/subprocess.py", line 364, in &lt;module&gt;
      import signal
    File "/Users/AdamLiu/anaconda/lib/python3.5/signal.py", line 8, in &lt;module&gt;
      _IntEnum._convert(
    File "/Users/AdamLiu/Git/google-cloud-sdk/lib/third_party/enum/__init__.py", line 366, in __getattr__
      raise AttributeError(name)
  AttributeError: _convert
  </code></pre>
  
  <p>Super thanks in advance!</p>