PEP0426 [*] support

[brantlk]

According to pep 0426, looks like I should be able to do pip install ComfyChair[*] to install all the extras defined for ComfyChair, but this isn't working and raises and exception instead. Also, I should be able to do pip install .[*] to install all the extras defined for the current package.

$ .tox/py27/bin/pip install ".[ldap]"

WORKS!

but these 2 fail:

$ .tox/py27/bin/pip install "keystone[*]"

or

$ .tox/py27/bin/pip install ".[*]"

with the following output:

Exception:
Traceback (most recent call last):
  File "/opt/stack/keystone/.tox/py27/local/lib/python2.7/site-packages/pip/basecommand.py", line 223, in main
    status = self.run(options, args)
  File "/opt/stack/keystone/.tox/py27/local/lib/python2.7/site-packages/pip/commands/install.py", line 270, in run
    wheel_cache
  File "/opt/stack/keystone/.tox/py27/local/lib/python2.7/site-packages/pip/basecommand.py", line 275, in populate_requirement_set
    wheel_cache=wheel_cache
  File "/opt/stack/keystone/.tox/py27/local/lib/python2.7/site-packages/pip/req/req_install.py", line 216, in from_line
    extras).extras
  File "/opt/stack/keystone/.tox/py27/local/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2980, in parse
    reqs = list(parse_requirements(s))
  File "/opt/stack/keystone/.tox/py27/local/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2920, in parse_requirements
    DISTRO, CBRACKET, line, p, (1,), "'extra' name"
  File "/opt/stack/keystone/.tox/py27/local/lib/python2.7/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2889, in scan_list
    raise RequirementParseError(msg, line, "at", line[p:])
RequirementParseError: Expected 'extra' name in __placeholder__[*] at *]

For the record:

$ .tox/py27/bin/pip --version
pip 7.1.0 from /opt/stack/keystone/.tox/py27/local/lib/python2.7/site-packages (python 2.7)

In keystone we have a tox.ini with a py27 testenv that has deps = .[ldap] and I'd like to change it to .[*] so that we don't have to keep the extras in sync with tox.ini.

[dstufft]

PEP 426 isn't accepted yet (though some parts of it are in defacto use and the particular syntax of using * to mean "all extras" hasn't yet been implemented.

[dstufft]

Closing this, PEP 426 never got accepted (although there are rumbling of working on it again) and I think that a placeholder for "when that is accepted, implement it" does not provide much value, we're unlikely to forget to implement the PEP after accepting it.