New submission from Raymond Hettinger:
Currently, help() lists out data descriptors in alphabetical order. This is
fine in the general case, however if the fields are parts of a named tuple, it
is more sensible to list them in the order found in the tuple.
The presence of a named tuple can be detected by the presence of a _fields
attribute that is a list of strings. That strings can be used as a primary
sort key before an alphabetical sort of anything not listed in _fields.
>>> Person = namedtuple('Person', ['nickname', 'firstname', 'age'])
>>> help(Person)
Help on class Person in module __main__:
class Person(builtins.tuple)
| Person(nickname, firstname, age)
|
...
|
| ----------------------------------------------------------------------
| Static methods defined here:
|
| __new__(_cls, nickname, firstname, age)
| Create new instance of Person(nickname, firstname, age)
|
| ----------------------------------------------------------------------
| Data descriptors defined here:
|
| __dict__
| A new OrderedDict mapping field names to their values
|
| age
| Alias for field number 2
|
| firstname
| Alias for field number 1
|
| nickname
| Alias for field number 0
|
| ----------------------------------------------------------------------
| Data and other attributes defined here:
|
| _fields = ('nickname', 'firstname', 'age')
|
...
The data descriptors should list nickname, then firstname, then age to match
the tuple order in _fields.
----------
components: Library (Lib)
messages: 248714
nosy: rhettinger
priority: normal
severity: normal
status: open
title: Pydoc to list data descriptors in _fields order if it exists
type: enhancement
versions: Python 3.6
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue24879>
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