[New-bugs-announce] [issue40796] dataclasses.make_dataclass: Exception when called with different field orders

[Darrick Yee]

New submission from Darrick Yee <darrick.yee at gmail.com>:

https://docs.python.org/3/library/dataclasses.html#module-dataclasses

`make_dataclass` takes a `field` parameter, which is an iterable whose entries may be tuples of `(name, type)` or `(name, type, dataclasses.Field)`.  However, an exception is thrown if such tuples are provided in a particular order.  Example:


from dataclasses import field, make_dataclass

fieldspec1 = ('field1', str)
fieldspec2 = ('field2', str, field(default='Hello'))

MyDc1 = make_dataclass('MyDc1', [fieldspec1, fieldspec2]) # Ok
MyDc2 = make_dataclass('MyDc2', [fieldspec2, fieldspec1]) # TypeError

I am guessing this is not intentional...

----------
messages: 370112
nosy: Darrick Yee
priority: normal
severity: normal
status: open
title: dataclasses.make_dataclass: Exception when called with different field orders
type: behavior
versions: Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40796>
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