New submission from Raymond Hettinger <raymond.hettin...@gmail.com>:
The following code (simplified from a real example) triggers an unexpected
TypeError:
@dataclass
class PrioritizedItem:
priority: 'int'
def __eq__(self, other):
return self.priority == other.priority
This code gives the following trackback:
Traceback (most recent call last):
File "/Users/raymond/Documents/tmp16.py", line 16, in <module>
@dataclass
File
"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/dataclasses.py",
line 598, in dataclass
return wrap(_cls)
File
"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/dataclasses.py",
line 590, in wrap
return _process_class(cls, repr, eq, order, hash, init, frozen)
File
"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/dataclasses.py",
line 539, in _process_class
_set_attribute(cls, '__hash__', None)
File
"/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/dataclasses.py",
line 444, in _set_attribute
raise TypeError(f'Cannot overwrite attribute {name} '
TypeError: Cannot overwrite attribute __hash__ in PrioritizedItem
----------
assignee: eric.smith
components: Library (Lib)
files: data_class_type_error.py
messages: 309901
nosy: eric.smith, rhettinger
priority: normal
severity: normal
status: open
title: Unusual TypeError with dataclass decorator
type: behavior
versions: Python 3.7
Added file: https://bugs.python.org/file47384/data_class_type_error.py
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<https://bugs.python.org/issue32546>
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