Wei-Shun Lo added the comment:

Bug encountered while installing multiple packages : 
1. keras
2. theano

Error Information : 
 ~/work/bottles @ dojos-MacBook-Pro (dojo)  
|=> pip3 install keras
Requirement already satisfied: keras in /usr/local/lib/python3.6/site-packages
Requirement already satisfied: scipy>=0.14 in 
/usr/local/lib/python3.6/site-packages (from keras)
Exception:
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/pip/basecommand.py", line 215, 
in main
    status = self.run(options, args)
  File "/usr/local/lib/python3.6/site-packages/pip/commands/install.py", line 
335, in run
    wb.build(autobuilding=True)
  File "/usr/local/lib/python3.6/site-packages/pip/wheel.py", line 749, in build
    self.requirement_set.prepare_files(self.finder)
  File "/usr/local/lib/python3.6/site-packages/pip/req/req_set.py", line 380, 
in prepare_files
    ignore_dependencies=self.ignore_dependencies))
  File "/usr/local/lib/python3.6/site-packages/pip/req/req_set.py", line 666, 
in _prepare_file
    check_dist_requires_python(dist)
  File "/usr/local/lib/python3.6/site-packages/pip/utils/packaging.py", line 
48, in check_dist_requires_python
    feed_parser.feed(metadata)
  File 
"/usr/local/Cellar/python3/3.6.2/Frameworks/Python.framework/Versions/3.6/lib/python3.6/email/feedparser.py",
 line 175, in feed
    self._input.push(data)
  File 
"/usr/local/Cellar/python3/3.6.2/Frameworks/Python.framework/Versions/3.6/lib/python3.6/email/feedparser.py",
 line 103, in push
    self._partial.write(data)
TypeError: string argument expected, got 'NoneType'
________________________________________________________________________________
 ~/work/bottles @ dojos-MacBook-Pro (dojo)  
|=> pip3 install theano
Collecting theano
  Downloading Theano-0.9.0.tar.gz (3.1MB)
    100% |████████████████████████████████| 3.1MB 353kB/s 
Requirement already satisfied: numpy>=1.9.1 in 
/usr/local/lib/python3.6/site-packages (from theano)
Requirement already satisfied: scipy>=0.14 in 
/usr/local/lib/python3.6/site-packages (from theano)
Exception:
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/pip/basecommand.py", line 215, 
in main
    status = self.run(options, args)
  File "/usr/local/lib/python3.6/site-packages/pip/commands/install.py", line 
335, in run
    wb.build(autobuilding=True)
  File "/usr/local/lib/python3.6/site-packages/pip/wheel.py", line 749, in build
    self.requirement_set.prepare_files(self.finder)
  File "/usr/local/lib/python3.6/site-packages/pip/req/req_set.py", line 380, 
in prepare_files
    ignore_dependencies=self.ignore_dependencies))
  File "/usr/local/lib/python3.6/site-packages/pip/req/req_set.py", line 666, 
in _prepare_file
    check_dist_requires_python(dist)
  File "/usr/local/lib/python3.6/site-packages/pip/utils/packaging.py", line 
48, in check_dist_requires_python
    feed_parser.feed(metadata)
  File 
"/usr/local/Cellar/python3/3.6.2/Frameworks/Python.framework/Versions/3.6/lib/python3.6/email/feedparser.py",
 line 175, in feed
    self._input.push(data)
  File 
"/usr/local/Cellar/python3/3.6.2/Frameworks/Python.framework/Versions/3.6/lib/python3.6/email/feedparser.py",
 line 103, in push
    self._partial.write(data)
TypeError: string argument expected, got 'NoneType'

----------

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31361>
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