[issue12943] tokenize: add python -m tokenize support back

[Meador Inge]

New submission from Meador Inge <meadori at gmail.com>:

In 2.x, 'python -m tokenize' worked great:

[meadori at motherbrain cpython]$ python2.7 -m tokenize test.py
1,0-1,5:        NAME    'print'
1,6-1,21:       STRING  '"Hello, World!"'
1,21-1,22:      NEWLINE '\n'
2,0-2,0:        ENDMARKER       ''

In 3.x, however, the functionality has been removed and replaced with
some hard-wired test code:

[meadori at motherbrain cpython]$ python3 -m tokenize test.py
TokenInfo(type=57 (ENCODING), string='utf-8', start=(0, 0), end=(0, 0), line='')
TokenInfo(type=1 (NAME), string='def', start=(1, 0), end=(1, 3),
line='def parseline(self, line):')
TokenInfo(type=1 (NAME), string='parseline', start=(1, 4), end=(1,
13), line='def parseline(self, line):')
TokenInfo(type=53 (OP), string='(', start=(1, 13), end=(1, 14),
line='def parseline(self, line):')
...

The functionality was removed here [1], but with no explanation.  Let's add it back and document the functionality this time around.

[1] http://hg.python.org/cpython/rev/51e24512e305/

----------
components: Library (Lib)
messages: 143752
nosy: meadori
priority: normal
severity: normal
stage: needs patch
status: open
title: tokenize: add python -m tokenize support back
type: feature request
versions: Python 3.3

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<http://bugs.python.org/issue12943>
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