New functions in site.py to get user/global site packages paths

[tarekziade]

BPO	6693
Nosy	@malemburg, @tiran, @tarekziade
Files	site.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/tarekziade'
closed_at = <Date 2009-08-20.21:28:39.228>
created_at = <Date 2009-08-13.08:31:56.754>
labels = ['type-feature', 'library']
title = 'New functions in site.py to get user/global site packages paths'
updated_at = <Date 2009-08-20.21:28:39.227>
user = 'https://github.com/tarekziade'

bugs.python.org fields:

activity = <Date 2009-08-20.21:28:39.227>
actor = 'tarek'
assignee = 'tarek'
closed = True
closed_date = <Date 2009-08-20.21:28:39.228>
closer = 'tarek'
components = ['Library (Lib)']
creation = <Date 2009-08-13.08:31:56.754>
creator = 'tarek'
dependencies = []
files = ['14719']
hgrepos = []
issue_num = 6693
keywords = ['patch']
message_count = 4.0
messages = ['91516', '91517', '91545', '91784']
nosy_count = 3.0
nosy_names = ['lemburg', 'christian.heimes', 'tarek']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue6693'
versions = ['Python 2.7', 'Python 3.2']

[tarekziade]

As discussed in Distutils-SIG.

Here's a patch for site.py that adds:

• getsitepackages : Returns a list containing all global site-packages
  directories (and possibly site-python).

• getusersitepackages: Returns the user-specific site-packages directory
  path.

• getuserbase: Returns the user base directory path.

[malemburg]

Two things:

• The globals should get a comment explaining what their purpose is and
  where they are being initialized.

• The get*() functions should only initialize the globals if they are
  set to None. In the patch, they are initialized every time the functions
  are called.

[tarekziade]

Done.

I've put Christian in the loop since he implemented the PEP-370
feature, to make sure these changes are fine with him.

[tarekziade]

applied in r74526 and r74529