duplicated signature of dataclass in help()

[sir-sigurd]

BPO	41415
Nosy	@sir-sigurd
PRs	bpo-41415: Remove duplicated signature from help() on dataclass #21652

^{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 = None
created_at = <Date 2020-07-28.04:39:59.072>
labels = ['type-bug', 'library', '3.10']
title = 'duplicated signature of dataclass in help()'
updated_at = <Date 2020-07-28.04:41:25.198>
user = 'https://github.com/sir-sigurd'

bugs.python.org fields:

activity = <Date 2020-07-28.04:41:25.198>
actor = 'sir-sigurd'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-07-28.04:39:59.072>
creator = 'sir-sigurd'
dependencies = []
files = []
hgrepos = []
issue_num = 41415
keywords = ['patch']
message_count = 1.0
messages = ['374461']
nosy_count = 1.0
nosy_names = ['sir-sigurd']
pr_nums = ['21652']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue41415'
versions = ['Python 3.10']

[sir-sigurd]

In [191]: import dataclasses, pydoc

In [192]: @DataClass
...: class C:
...: pass
...:

In [193]: print(pydoc.render_doc(C))
Python Library Documentation: class C in module __main__

class C(builtins.object)
 |  C() -> None
 |
 |  C()
 |
 |  Methods defined here:
 |
 ....

It's duplicated because dataclass __doc__ defaults to signature:

In [195]: C.__doc__
Out[195]: 'C()'