Habitat: support core/pip for python

[HackerWilson]

in do_build() I want to install pip deps, but I get these errors:

Traceback (most recent call last):
  File "get-pip.py", line 19177, in <module>
    main()
  File "get-pip.py", line 194, in main
    bootstrap(tmpdir=tmpdir)
  File "get-pip.py", line 82, in bootstrap
    import pip
zipimport.ZipImportError: can't decompress data; zlib not available

the problem is core/python didn't compiled with zlib.

so could you please support pip for python?

[bixu]

+1

[rdeusser]

core/zlib is in pkg_deps. Does it need to be in pkg_build_deps as well?

[metadave]

core/zlib is in pkg_deps. Does it need to be in pkg_build_deps as well?
yes.

I played with this a few months ago, but had to switch to something else so it was left unfinished. Leaving these links here as I was trying some of the suggested techniques:
http://stackoverflow.com/questions/12344970/building-python-from-source-with-zlib-support
http://stackoverflow.com/questions/6169522/no-module-named-zlib

[jtimberman]

@scassiba just added zlib support in PR #874 - it's merged and we'll get a new release of the package out.

[jtimberman]

Going to wait on SSL support, and possibly pip, for both python and python2 before cutting a new package of either.

[bixu]

+1 to pip - dependency management is gnarly enough when using Python with pip that any ability to wrap it up in a Habitat package would be fantastic (and most Python projects I know of are using pip).

[sbcas]

core/python and core/python2 now ship pip binaries