[Bug 5404] New: Mercurial easy_install on Mac Sierra prints NoneType exception, sorta breaks python install

[bugzilla at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=5404

            Bug ID: 5404
           Summary: Mercurial easy_install on Mac Sierra prints NoneType
                    exception, sorta breaks python install
           Product: Mercurial
           Version: default branch
          Hardware: PC
                OS: Mac OS
            Status: UNCONFIRMED
          Severity: feature
          Priority: wish
         Component: Mercurial
          Assignee: bugzilla at selenic.com
          Reporter: andi.m.mcclure at gmail.com
                CC: mercurial-devel at selenic.com

Created attachment 1935
  --> https://bz.mercurial-scm.org/attachment.cgi?id=1935&action=edit
ATTACHMENT 1

I apologize I only have screenshots for this, but I accidentally cleared the
text.

So, I got a new mac laptop out of the box. I upgraded it to Sierra. I then
immediately wanted to install MacPorts and Mercurial. I installed macports via
the normal method but didn't install anything else. (I say this to stress I do
not have an unusual system configuration.) I then installed Mercurial via:

easy_install mercurial

which didn't work because I was not root, so I went on to say:

sudo easy_install mercurial

This failed, with ATTACHMENT 1. After running, hg was not found (see ATTACHMENT
2).

At this point a friend pointed out I should have installed pip and then done
`pip install -U --user mercurial`  anyway, as that is smarter than
sudo-installing third party software. That makes sense! But I can't do that,
because it thinks Mercurial is already installed (see ATTACHMENT 2).

Well, okay, I'll uninstall Mercurial and try again. But I *can't uninstall
mercurial*. See ATTACHMENT 3.

EXPECTED BEHAVIOR: Installing Mercurial through a standard method on a major
operating system should not result in an error. After installing Mercurial, it
should be possible to uninstall it through the standard method.

---

Notes:

First off, I don't know if what I saw was actually problem with Mercurial, or
with easy_install under Sierra. However, the exception was thrown from your
__init__.py.

Second off, my immediate problem is resolved. It turns out I can do `pip
install -U --user --ignore-installed mercurial`. It succeeded, so now I have a
personal copy of mercurial in ~/Library and everything is nice.

But, third off, since I *did* hit the original error condition, I now have a
directory
/Library/Python/2.7/site-packages/mercurial-3.9.2-py2.7-macosx-10.12-intel.egg
and I don't know what it is and I don't actually know if it's safe for me to
delete it. Should I delete this directory? :(

I posted this bug as "default branch" because there is no 3.9.2 Version listed.

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