windows python launcher should support explicit 64-bit version

[theller]

BPO	20391
Nosy	@loewis, @theller, @tjguk, @zware, @zooba

^{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 2019-08-02.22:06:03.071>
created_at = <Date 2014-01-25.16:18:17.317>
labels = ['type-feature', 'OS-windows']
title = 'windows python launcher should support explicit 64-bit version'
updated_at = <Date 2019-08-02.22:06:03.069>
user = 'https://github.com/theller'

bugs.python.org fields:

activity = <Date 2019-08-02.22:06:03.069>
actor = 'steve.dower'
assignee = 'none'
closed = True
closed_date = <Date 2019-08-02.22:06:03.071>
closer = 'steve.dower'
components = ['Windows']
creation = <Date 2014-01-25.16:18:17.317>
creator = 'theller'
dependencies = []
files = []
hgrepos = []
issue_num = 20391
keywords = []
message_count = 4.0
messages = ['209215', '235811', '235822', '348922']
nosy_count = 5.0
nosy_names = ['loewis', 'theller', 'tim.golden', 'zach.ware', 'steve.dower']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue20391'
versions = ['Python 3.5']

[theller]

The windows python launcher supports the '-3.3' resp. '-3.3-32' command line switches to ask for 'the best 3.3' version resp. 'the 32-bit 3.3' version, but does not support a '-3.3-64' switch to explicitely request the 64-bit version of Python.

I suggest that this support should be added.

[BreamoreBoy]

Having read https://docs.python.org/3/using/windows.html#customizing-default-python-versions I'm not convinced that this is needed, as the first sentence of the fifth paragraph states "On 64-bit Windows with both 32-bit and 64-bit implementations of the same (major.minor) Python version installed, the 64-bit version will always be preferred."

[zooba]

It may be useful if you want an error rather than the 32-bit version, though there are other ways to check that if it's critical and it probably is better in the script.

Patches welcome :)

[zooba]

This has been implemented.