[New-bugs-announce] [issue33025] urlencode produces bad output from ssl.CERT_NONE and friends that chokes decoders

[Vitaly Kruglikov]

New submission from Vitaly Kruglikov <vitaly.krug at gmail.com>:

```
In [9]: from urllib.parse import urlencode, parse_qs

In [10]: import ast, ssl

In [11]: d = dict(cert_reqs=ssl.CERT_NONE)

In [12]: urlencode(d)
Out[12]: 'cert_reqs=VerifyMode.CERT_NONE'

In [25]: parse_qs('cert_reqs=VerifyMode.CERT_NONE')
Out[25]: {'cert_reqs': ['VerifyMode.CERT_NONE']}
In [29]: ast.literal_eval('VerifyMode.CERT_NONE')
Traceback (most recent call last)
...
ValueError: malformed node or string: <_ast.Attribute object at 0x105c22358>
```

This used to work fine and produce `'cert_reqs=0'` on Python 2.7, allowing it to be decoded properly downstream. However, `'cert_reqs=VerifyMode.CERT_NONE'` can't be decoded generically. So, something it's that used to work in prior python versions that is breaking now.

Additional information. json.dumps() actually dumps that value as a number instead of 'VerifyMode.CERT_NONE'. 

It appears that urlencode doesn't work properly with enums, where I would expect it to emit the numeric value of the enum.

----------
assignee: christian.heimes
components: Library (Lib), SSL
messages: 313424
nosy: christian.heimes, vitaly.krug
priority: normal
severity: normal
status: open
title: urlencode produces bad output from ssl.CERT_NONE and friends that chokes decoders
type: crash
versions: Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33025>
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