pip error while installing package in Cygwin/Python2.7

Question

I installed Python2.7.3 in Cygwin using this guide, I then installed pip from source.

When I try to use pip:

$ pip install sqlalchemy
Downloading/unpacking sqlalchemy
Downloading SQLAlchemy-0.7.8.tar.gz (2.6Mb): 2.6Mb downloaded
Running setup.py egg_info for package sqlalchemy
  137 [main] python2.7 1060 child_info_fork::abort: address space needed by 'itertools.dll' (0x2C0000) is already occupied
  Error [Errno 11] Resource temporarily unavailable while executing command python setup.py egg_info
Exception:
Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/basecommand.py", line 104, in main
  status = self.run(options, args)
File "/usr/local/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/commands/install.py", line 245, in run
  requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
File "/usr/local/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/req.py", line 1009, in prepare_files
  req_to_install.run_egg_info()
File "/usr/local/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/req.py", line 225, in run_egg_info
  command_desc='python setup.py egg_info')
File "/usr/local/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/__init__.py", line 221, in call_subprocess
  cwd=cwd, env=env)
File "/usr/local/lib/python2.7/subprocess.py", line 679, in __init__
  errread, errwrite)
File "/usr/local/lib/python2.7/subprocess.py", line 1143, in _execute_child
  self.pid = os.fork()
OSError: [Errno 11] Resource temporarily unavailable

Storing complete log in /home/joshfriend/.pip/pip.log

Found a guide noting that this happens, and said that running rebaseall should fix this. I tried, and it didn't. I would assume that this is because I did not install python2.7 with the cygwin installer and therefore was not affected by the rebaseall.

UPDATE:

I gave the wrong link to the instructions I used to install python (sorry). I went back and fixed my explanation of what I did...

Answer 1

You can't just "run rebaseall" the way the site you link to implies. You need to do the following:

1. Exit all running Cygwin programs. Yes, all of them, even your shell, even MinTTY, even X11.
2. Start > Run > C:\cygwin\bin\ash.exe > OK.
3. cd /bin
4. Type ./rebaseall and press Return.
5. That may take a few minutes. Go get a coffee.
6. Come back, try again.

I've no idea how apt-cyg works, but it appears to use the standard Cygwin repositories. Unless you have very good reason to do otherwise, I'd use the standard Cygwin setup.exe installer for all your install/upgrade/whatever needs, as it does a pretty good job of doing all your rebasing for you.

In particular, if the above steps don't work, I'd uninstall Python with apt-cyg, and try again by installing it with the standard installer. You can download it again from cygwin.com if you need to.