Update multiprocessing examples to Py3 and test

[terryjreedy]

BPO	22304
Nosy	@terryjreedy

^{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 = None
closed_at = <Date 2014-08-29.23:36:55.313>
created_at = <Date 2014-08-29.23:25:38.926>
labels = ['type-bug', 'invalid', 'docs']
title = 'Update multiprocessing examples to Py3 and test'
updated_at = <Date 2014-08-29.23:36:55.311>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2014-08-29.23:36:55.311>
actor = 'terry.reedy'
assignee = 'docs@python'
closed = True
closed_date = <Date 2014-08-29.23:36:55.313>
closer = 'terry.reedy'
components = ['Documentation']
creation = <Date 2014-08-29.23:25:38.926>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 22304
keywords = []
message_count = 2.0
messages = ['226103', '226105']
nosy_count = 3.0
nosy_names = ['terry.reedy', 'docs@python', 'sbt']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'needs patch'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue22304'
versions = ['Python 3.4', 'Python 3.5']

[terryjreedy]

https://docs.python.org/2/library/multiprocessing.html#examples
contains several examples in Python2 code that need to be updated for Python 3. Richard, if you have them in .py files, perhaps you could run them through 2to3 and then test.

# Example where a pool of http servers share a single listening socket
from BaseHTTPServer import HTTPServer
from SimpleHTTPServer import SimpleHTTPRequestHandler
...
    print 'Serving at http://%s:%d using %d worker processes' % \
          (ADDRESS[0], ADDRESS[1], NUMBER_OF_PROCESSES)
    print 'To exit press Ctrl-' + ['C', 'Break'][sys.platform=='win32']

#update
from http.server import HTTPServer, SimpleHTTPRequestHandler
...
    print('Serving at http://%s:%d using %d worker processes' % \
          (ADDRESS[0], ADDRESS[1], NUMBER_OF_PROCESSES))
    print('To exit press Ctrl-' + ['C', 'Break'][sys.platform=='win32'])

This still does not run on Windows
_pickle.PicklingError: Can't pickle <class '_thread.lock'>: attribute lookup lock on _thread failed
but that was true in 2.7 also (bpo-21204).

[terryjreedy]

Sorry, copied and pasted from the wrong place. Forget this.