pip cannot install anything

> pip install yolk
Downloading/unpacking yolk
  Cannot fetch index base URL https://pypi.python.org/simple/
  Could not find any downloads that satisfy the requirement yolk
No distributions at all found for yolk
Storing complete log in /Users/harith/.pip/pip.log

when I read the file I see

> cat /Users/harith/.pip/pip.log
------------------------------------------------------------
/Users/harith/.shared/virtualenvs/pennytracker/bin/pip run on Mon Jul  1 20:26:02 2013
Downloading/unpacking yolk

  Getting page https://pypi.python.org/simple/yolk/
  Could not fetch URL https://pypi.python.org/simple/yolk/: HTTP Error 503: Service Unavailable
  Will skip URL https://pypi.python.org/simple/yolk/ when looking for download links for yolk
  Getting page https://pypi.python.org/simple/
  Could not fetch URL https://pypi.python.org/simple/: HTTP Error 503: Service Unavailable
  Will skip URL https://pypi.python.org/simple/ when looking for download links for yolk
  Cannot fetch index base URL https://pypi.python.org/simple/

  URLs to search for versions for yolk:
  * https://pypi.python.org/simple/yolk/
  Getting page https://pypi.python.org/simple/yolk/
  Could not fetch URL https://pypi.python.org/simple/yolk/: HTTP Error 503: Service Unavailable
  Will skip URL https://pypi.python.org/simple/yolk/ when looking for download links for yolk
  Could not find any downloads that satisfy the requirement yolk

No distributions at all found for yolk

    Exception information:
    Traceback (most recent call last):
      File "/Users/harith/.shared/virtualenvs/pennytracker/lib/python2.7/site-packages/pip-1.3.1-py2.7.egg/pip/basecommand.py", line 139, in main
        status = self.run(options, args)
      File "/Users/harith/.shared/virtualenvs/pennytracker/lib/python2.7/site-packages/pip-1.3.1-py2.7.egg/pip/commands/install.py", line 266, in run
        requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
      File "/Users/harith/.shared/virtualenvs/pennytracker/lib/python2.7/site-packages/pip-1.3.1-py2.7.egg/pip/req.py", line 1026, in prepare_files
        url = finder.find_requirement(req_to_install, upgrade=self.upgrade)
      File "/Users/harith/.shared/virtualenvs/pennytracker/lib/python2.7/site-packages/pip-1.3.1-py2.7.egg/pip/index.py", line 171, in find_requirement
        raise DistributionNotFound('No distributions at all found for %s' % req)
    DistributionNotFound: No distributions at all found for yolk

Am i doing anything wrong?

Answer

This is the full text of the blog post linked below:

If you’ve tried installing a package with pip recently, you may have encountered this error:

Could not fetch URL https://pypi.python.org/simple/Django/: There was a problem confirming the ssl certificate: <urlopen error [Errno 1] _ssl.c:504: error:0D0890A1:asn1 encoding routines:ASN1_verify:unknown message digest algorithm>
  Will skip URL https://pypi.python.org/simple/Django/ when looking for download links for Django==1.5.1 (from -r requirements.txt (line 1))
  Could not fetch URL https://pypi.python.org/simple/: There was a problem confirming the ssl certificate: <urlopen error [Errno 1] _ssl.c:504: error:0D0890A1:asn1 encoding routines:ASN1_verify:unknown message digest algorithm>
  Will skip URL https://pypi.python.org/simple/ when looking for download links for Django==1.5.1 (from -r requirements.txt (line 1))
  Cannot fetch index base URL https://pypi.python.org/simple/
  Could not fetch URL https://pypi.python.org/simple/Django/1.5.1: There was a problem confirming the ssl certificate: <urlopen error [Errno 1] _ssl.c:504: error:0D0890A1:asn1 encoding routines:ASN1_verify:unknown message digest algorithm>
  Will skip URL https://pypi.python.org/simple/Django/1.5.1 when looking for download links for Django==1.5.1 (from -r requirements.txt (line 1))
  Could not fetch URL https://pypi.python.org/simple/Django/: There was a problem confirming the ssl certificate: <urlopen error [Errno 1] _ssl.c:504: error:0D0890A1:asn1 encoding routines:ASN1_verify:unknown message digest algorithm>
  Will skip URL https://pypi.python.org/simple/Django/ when looking for download links for Django==1.5.1 (from -r requirements.txt (line 1))
  Could not find any downloads that satisfy the requirement Django==1.5.1 (from -r requirements.txt (line 1))
No distributions at all found for Django==1.5.1 (from -r requirements.txt (line 1))
Storing complete log in /Users/paul/.pip/pip.log

This seems to be an issue with an old version of OpenSSL being incompatible with pip 1.3.1. If you’re using a non-stock Python distribution (notably EPD 7.3), you’re very likely to have a setup that isn’t going to work with pip 1.3.1 without a shitload of work.

The easy workaround for now, is to install pip 1.2.1, which does not require SSL:

curl -O https://pypi.python.org/packages/source/p/pip/pip-1.2.1.tar.gz
tar xvfz pip-1.2.1.tar.gz
cd pip-1.2.1
python setup.py install

If you are using EPD, and you’re not using it for a class where things might break, you may want to consider installing the new incarnation: Enthought Canopy. I know they were aware of the issues caused by the previous version of OpenSSL, and would imagine they are using a new version now that should play nicely with pip 1.3.1.

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