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+TODOs
+-----
+
+* if homepage_url (in the pypi metadata for a given pacakge) is a html page,
+scrape the page for repo links, this should reduce the number of tarball
+imports the tool does.
+
+* scheme x.y e.g. pip.find_deps should avoid using a '.' makes it more
+difficult to import extensions as modules, consider the case where we want
+to import pip.find_deps for use in a test suite.
+
+* prefix cmd to logs, so when we run pip, prefix log msg with 'pip',
+same for egg_info etc
+
+* abstract popen/log,
+there is a pattern of calling Popen with stderr=STDOUT and reading
+from p.stdout till EOF, then waiting for the subprocess to terminate.
+Since this is used in 3 places, it should be factored out really.
+
+* error messages for constraints is currently a parsed form of the version
+number e.g. ('==', ('00000000', '00000000',      '00000011', '*final'))
+this will be confusing, we should emit nice version numbers.
+
+* Can we avoid the compilation that happens during import of some packages,
+i.e. nixtla
+
+* need better errmsg if initial package not found on pypi
+
+* Importing python packages that use pbr fails, see
+https://bitbucket.org/pypa/setuptools/issue/73/typeerror-dist-must-be-a-distribution#comment-7267980
+The most sensible option would seem to be to make use of the sane environment
+that pbr provides: just read the dependency information from the text files
+that pbr projects provide, see, http://docs.openstack.org/developer/pbr/