Recent changes broke ez_setup.py on Windows

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Originally reported by: niik (Bitbucket: niik, GitHub: niik)

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This diff or commits 16007a2acbc5662238695f42d3d2ec1db09f0208 and 1e3d99eb4258dc5e7eb506509221c9d350acb9c3 broke downloading the setup zip on WIndows systems with powershell.

The return value from _resolve_version ends up being a unicode string which in turn makes the string interpolation in download_file_powershell produce a string similar to (new-object System.Net.WebClient).DownloadFile(u'https://pypi.python.org/packages/source/s/setuptools/setuptools-19.1.zip', u'setuptools-19.1.zip') which obviously powershell doesn't like:

At line:1 char:48
+ (new-object System.Net.WebClient).DownloadFile(u'https://pypi.python.org/package ...
+                                                ~
Missing ')' in method call.
At line:1 char:48
+ (new-object System.Net.WebClient).DownloadFile(u'https://pypi.python.org/package ...
+                                                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Unexpected token 'u'https://pypi.python.org/packages/source/s/setuptools/setuptools-19.1.zip'' in expression or stateme
nt.
At line:1 char:123
+ ... tools-19.1.zip', u'e:\tmp\setuptools-19.1.zip')
+                    ~
Missing argument in parameter list.
At line:1 char:154
+ ... tools-19.1.zip')
+                    ~
Unexpected token ')' in expression or statement.
    + CategoryInfo          : ParserError: (:) [], ParentContainsErrorRecordException
    + FullyQualifiedErrorId : MissingEndParenthesisInMethodCall

The quick and dirty fix is to change the return line in _resolve_version to return doc['info']['version'].encode('ascii') but I'm guessing switching to the something like str.format which does implicit conversion is preferable.

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• Bitbucket: https://bitbucket.org/pypa/setuptools/issue/477

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Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Duplicate of #476.

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Thanks for the bug report. As the cause is the same, I'm marking this as a duplicate, even though the failure mode is very different.

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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On second thought, this issue is in fact distinct.

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Explicitly quote strings rather than relying on repr. Fixes #477.

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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bootstrap script has been updated and I confirmed the bootstrap installer now passes on Python 2 on Windows.