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Mixing generic container from typing and built-in crashes on py3.7-8 #218

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bibajz opened this issue Feb 3, 2022 · 0 comments · Fixed by #219
Closed

Mixing generic container from typing and built-in crashes on py3.7-8 #218

bibajz opened this issue Feb 3, 2022 · 0 comments · Fixed by #219

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@bibajz
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bibajz commented Feb 3, 2022

  • cattrs version: 22.1.0dev0
  • Python version: 3.7, 3.8 (FAILS) 3.9, 3.10 (OK)
  • Operating System: irrelevant

Description

Specifying an empty generic type from a standard library - so far tested on dict and list - crashes, since these types do not have __args__ attribute until py3.9

Python 3.8.10 (default, Nov 26 2021, 20:14:08) 
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import typing as t
>>> 
>>> import attrs
>>> import cattrs
>>>
>>> @attrs.define
... class A1:
...     bs: t.List[dict]
... 

>>> @attrs.define
... class A2:
...     bs: t.List[list]
...

>>> @attrs.define
... class D:
...     d: dict
... 

>>> cattrs.structure({"bs": [{}, {"a": 1}]}, A1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/converters.py", line 300, in structure
    return self._structure_func.dispatch(cl)(obj, cl)
  File "<cattrs generated structure __main__.A1>", line 3, in structure_A1
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/converters.py", line 478, in _structure_list
    return [
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/converters.py", line 479, in <listcomp>
    self._structure_func.dispatch(elem_type)(e, elem_type)
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/dispatch.py", line 49, in _dispatch
    return self._function_dispatch.dispatch(cl)
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/dispatch.py", line 126, in dispatch
    return handler(typ)
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/converters.py", line 790, in gen_structure_mapping
    h = make_mapping_structure_fn(cl, self)
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/gen.py", line 465, in make_mapping_structure_fn
    if not is_bare(cl):
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/_compat.py", line 171, in is_bare
    args = type.__args__
AttributeError: type object 'dict' has no attribute '__args__'

>>> cattrs.structure({"bs": [[], [1]]}, A2)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/converters.py", line 300, in structure
    return self._structure_func.dispatch(cl)(obj, cl)
  File "<cattrs generated structure __main__.A2>", line 3, in structure_A2
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/converters.py", line 478, in _structure_list
    return [
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/converters.py", line 479, in <listcomp>
    self._structure_func.dispatch(elem_type)(e, elem_type)
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/converters.py", line 474, in _structure_list
    if is_bare(cl) or cl.__args__[0] is Any:
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/_compat.py", line 171, in is_bare
    args = type.__args__
AttributeError: type object 'list' has no attribute '__args__'
>>>
>>> cattrs.structure({"d": {}}, D)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/converters.py", line 300, in structure
    return self._structure_func.dispatch(cl)(obj, cl)
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/dispatch.py", line 49, in _dispatch
    return self._function_dispatch.dispatch(cl)
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/dispatch.py", line 126, in dispatch
    return handler(typ)
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/converters.py", line 740, in gen_structure_attrs_fromdict
    h = make_dict_structure_fn(
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/gen.py", line 280, in make_dict_structure_fn
    handler = converter._structure_func.dispatch(t)
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/dispatch.py", line 49, in _dispatch
    return self._function_dispatch.dispatch(cl)
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/dispatch.py", line 126, in dispatch
    return handler(typ)
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/converters.py", line 790, in gen_structure_mapping
    h = make_mapping_structure_fn(cl, self)
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/gen.py", line 465, in make_mapping_structure_fn
    if not is_bare(cl):
  File "/home/libor/.virtualenvs/cattrs/lib/python3.8/site-packages/cattr/_compat.py", line 171, in is_bare
    args = type.__args__
AttributeError: type object 'dict' has no attribute '__args__'

Swapping dict/list for their upper-cased variants produces expected behaviour

>>> @attrs.define
... class D2:
...     d: typing.Dict
... 
>>> 
>>> cattrs.structure({"d": {}}, D2)
D2(d={})
mergify bot pushed a commit to aws/jsii that referenced this issue Apr 4, 2022
…2 in /packages/@jsii/python-runtime (#3470)

Updates the requirements on [cattrs](https://github.com/python-attrs/cattrs) to permit the latest version.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/python-attrs/cattrs/blob/main/HISTORY.rst">cattrs's changelog</a>.</em></p>
<blockquote>
<h2>22.1.0 (2022-04-03)</h2>
<ul>
<li>cattrs now uses the CalVer versioning convention.</li>
<li>cattrs now has a detailed validation mode, which is enabled by default. Learn more <code>here &lt;https://cattrs.readthedocs.io/en/latest/validation.html&gt;</code>_.
The old behavior can be restored by creating the converter with <code>detailed_validation=False</code>.</li>
<li><code>attrs</code> and dataclass structuring is now ~25% faster.</li>
<li>Fix an issue structuring bare <code>typing.List</code> s on Pythons lower than 3.9.
(<code>[#209](python-attrs/cattrs#209) &lt;https://github.com/python-attrs/cattrs/issues/209&gt;</code>_)</li>
<li>Fix structuring of non-parametrized containers like <code>list/dict/...</code> on Pythons lower than 3.9.
(<code>[#218](python-attrs/cattrs#218) &lt;https://github.com/python-attrs/cattrs/issues/218&gt;</code>_)</li>
<li>Fix structuring bare <code>typing.Tuple</code> on Pythons lower than 3.9.
(<code>[#218](python-attrs/cattrs#218) &lt;https://github.com/python-attrs/cattrs/issues/218&gt;</code>_)</li>
<li>Fix a wrong <code>AttributeError</code> of an missing <code>__parameters__</code> attribute. This could happen
when inheriting certain generic classes – for example <code>typing.*</code> classes are affected.
(<code>[#217](python-attrs/cattrs#217) &lt;https://github.com/python-attrs/cattrs/issues/217&gt;</code>_)</li>
<li>Fix structuring of <code>enum.Enum</code> instances in <code>typing.Literal</code> types.
(<code>[#231](python-attrs/cattrs#231) &lt;https://github.com/python-attrs/cattrs/pull/231&gt;</code>_)</li>
<li>Fix unstructuring all tuples - unannotated, variable-length, homogenous and heterogenous - to <code>list</code>.
(<code>[#226](python-attrs/cattrs#226) &lt;https://github.com/python-attrs/cattrs/issues/226&gt;</code>_)</li>
<li>For <code>forbid_extra_keys</code> raise custom <code>ForbiddenExtraKeyError</code> instead of generic <code>Exception</code>.
(<code>[#225](python-attrs/cattrs#225) &lt;https://github.com/python-attrs/cattrs/pull/225&gt;</code>_)</li>
<li>All preconf converters now support <code>loads</code> and <code>dumps</code> directly. See an example <code>here &lt;https://cattrs.readthedocs.io/en/latest/preconf.html&gt;</code>_.</li>
<li>Fix mappings with byte keys for the orjson, bson and tomlkit converters.
(<code>[#241](python-attrs/cattrs#241) &lt;https://github.com/python-attrs/cattrs/issues/241&gt;</code>_)</li>
</ul>
<h2>1.10.0 (2022-01-04)</h2>
<ul>
<li>Add PEP 563 (string annotations) support for dataclasses.
(<code>[#195](python-attrs/cattrs#195) &lt;https://github.com/python-attrs/cattrs/issues/195&gt;</code>_)</li>
<li>Fix handling of dictionaries with string Enum keys for bson, orjson, and tomlkit.</li>
<li>Rename the <code>cattr.gen.make_dict_unstructure_fn.omit_if_default</code> parameter to <code>_cattrs_omit_if_default</code>, for consistency. The <code>omit_if_default</code> parameters to <code>GenConverter</code> and <code>override</code> are unchanged.</li>
<li>Following the changes in <code>attrs</code> 21.3.0, add a <code>cattrs</code> package mirroring the existing <code>cattr</code> package. Both package names may be used as desired, and the <code>cattr</code> package isn't going away.</li>
</ul>
<h2>1.9.0 (2021-12-06)</h2>
<ul>
<li>Python 3.10 support, including support for the new union syntax (<code>A | B</code> vs <code>Union[A, B]</code>).</li>
<li>The <code>GenConverter</code> can now properly structure generic classes with generic collection fields.
(<code>[#149](python-attrs/cattrs#149) &lt;https://github.com/python-attrs/cattrs/issues/149&gt;</code>_)</li>
<li><code>omit=True</code> now also affects generated structuring functions.
(<code>[#166](python-attrs/cattrs#166) &lt;https://github.com/python-attrs/cattrs/issues/166&gt;</code>_)</li>
<li><code>cattr.gen.{make_dict_structure_fn, make_dict_unstructure_fn}</code> now resolve type annotations automatically when PEP 563 is used.
(<code>[#169](python-attrs/cattrs#169) &lt;https://github.com/python-attrs/cattrs/issues/169&gt;</code>_)</li>
<li>Protocols are now unstructured as their runtime types.
(<code>[#177](python-attrs/cattrs#177) &lt;https://github.com/python-attrs/cattrs/pull/177&gt;</code>_)</li>
<li>Fix an issue generating structuring functions with renaming and <code>_cattrs_forbid_extra_keys=True</code>.
(<code>[#190](python-attrs/cattrs#190) &lt;https://github.com/python-attrs/cattrs/issues/190&gt;</code>_)</li>
</ul>
<h2>1.8.0 (2021-08-13)</h2>
<ul>
<li>Fix <code>GenConverter</code> mapping structuring for unannotated dicts on Python 3.8.</li>
</ul>

</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a href="https://github.com/python-attrs/cattrs/commits">compare view</a></li>
</ul>
</details>
<br />


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---

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</details>
mergify bot pushed a commit to aws/jsii that referenced this issue Oct 3, 2022
…3 in /packages/@jsii/python-runtime (#3785)

Updates the requirements on [cattrs](https://github.com/python-attrs/cattrs) to permit the latest version.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/python-attrs/cattrs/blob/main/HISTORY.rst">cattrs's changelog</a>.</em></p>
<blockquote>
<h2>22.2.0 (2022-10-03)</h2>
<ul>
<li><em>Potentially breaking</em>: <code>cattrs.Converter</code> has been renamed to <code>cattrs.BaseConverter</code>, and <code>cattrs.GenConverter</code> to <code>cattrs.Converter</code>.
The <code>GenConverter</code> name is still available for backwards compatibility, but is deprecated.
If you were depending on functionality specific to the old <code>Converter</code>, change your import to <code>from cattrs import BaseConverter</code>.</li>
<li><code>NewTypes &lt;https://docs.python.org/3/library/typing.html#newtype&gt;</code>_ are now supported by the <code>cattrs.Converter</code>.
(<code>[#255](python-attrs/cattrs#255) &lt;https://github.com/python-attrs/cattrs/pull/255&gt;</code><em>, <code>[#94](python-attrs/cattrs#94) &lt;https://github.com/python-attrs/cattrs/issues/94&gt;</code></em>, <code>[#297](python-attrs/cattrs#297) &lt;https://github.com/python-attrs/cattrs/issues/297&gt;</code>_)</li>
<li><code>cattrs.Converter</code> and <code>cattrs.BaseConverter</code> can now copy themselves using the <code>copy</code> method.
(<code>[#284](python-attrs/cattrs#284) &lt;https://github.com/python-attrs/cattrs/pull/284&gt;</code>_)</li>
<li>Python 3.11 support.</li>
<li>cattrs now supports un/structuring <code>kw_only</code> fields on attrs classes into/from dictionaries.
(<code>[#247](python-attrs/cattrs#247) &lt;https://github.com/python-attrs/cattrs/pull/247&gt;</code>_)</li>
<li>PyPy support (and tests, using a minimal Hypothesis profile) restored.
(<code>[#253](python-attrs/cattrs#253) &lt;https://github.com/python-attrs/cattrs/issues/253&gt;</code>_)</li>
<li>Fix propagating the <code>detailed_validation</code> flag to mapping and counter structuring generators.</li>
<li>Fix <code>typing.Set</code> applying too broadly when used with the <code>GenConverter.unstruct_collection_overrides</code> parameter on Python versions below 3.9. Switch to <code>typing.AbstractSet</code> on those versions to restore the old behavior.
(<code>[#264](python-attrs/cattrs#264) &lt;https://github.com/python-attrs/cattrs/issues/264&gt;</code>_)</li>
<li>Uncap the required Python version, to avoid problems detailed in <a href="https://iscinumpy.dev/post/bound-version-constraints/#pinning-the-python-version-is-special">https://iscinumpy.dev/post/bound-version-constraints/#pinning-the-python-version-is-special</a>
(<code>[#275](python-attrs/cattrs#275) &lt;https://github.com/python-attrs/cattrs/issues/275&gt;</code>_)</li>
<li>Fix <code>Converter.register_structure_hook_factory</code> and <code>cattrs.gen.make_dict_unstructure_fn</code> type annotations.
(<code>[#281](python-attrs/cattrs#281) &lt;https://github.com/python-attrs/cattrs/issues/281&gt;</code>_)</li>
<li>Expose all error classes in the <code>cattr.errors</code> namespace. Note that it is deprecated, just use <code>cattrs.errors</code>.
(<code>[#252](python-attrs/cattrs#252) &lt;https://github.com/python-attrs/cattrs/issues/252&gt;</code>_)</li>
<li>Fix generating structuring functions for types with quotes in the name.
(<code>[#291](python-attrs/cattrs#291) &lt;https://github.com/python-attrs/cattrs/issues/291&gt;</code>_ <code>[#277](python-attrs/cattrs#277) &lt;https://github.com/python-attrs/cattrs/issues/277&gt;</code>_)</li>
<li>Fix usage of notes for the final version of <code>PEP 678 &lt;https://peps.python.org/pep-0678/&gt;</code><em>, supported since <code>exceptiongroup&gt;=1.0.0rc4</code>.
(<code>[#303](python-attrs/cattrs#303) &lt;303 &lt;https://github.com/python-attrs/cattrs/pull/303&gt;</code></em>)</li>
</ul>
<h2>22.1.0 (2022-04-03)</h2>
<ul>
<li>cattrs now uses the CalVer versioning convention.</li>
<li>cattrs now has a detailed validation mode, which is enabled by default. Learn more <code>here &lt;https://cattrs.readthedocs.io/en/latest/validation.html&gt;</code>_.
The old behavior can be restored by creating the converter with <code>detailed_validation=False</code>.</li>
<li><code>attrs</code> and dataclass structuring is now ~25% faster.</li>
<li>Fix an issue structuring bare <code>typing.List</code> s on Pythons lower than 3.9.
(<code>[#209](python-attrs/cattrs#209) &lt;https://github.com/python-attrs/cattrs/issues/209&gt;</code>_)</li>
<li>Fix structuring of non-parametrized containers like <code>list/dict/...</code> on Pythons lower than 3.9.
(<code>[#218](python-attrs/cattrs#218) &lt;https://github.com/python-attrs/cattrs/issues/218&gt;</code>_)</li>
<li>Fix structuring bare <code>typing.Tuple</code> on Pythons lower than 3.9.
(<code>[#218](python-attrs/cattrs#218) &lt;https://github.com/python-attrs/cattrs/issues/218&gt;</code>_)</li>
<li>Fix a wrong <code>AttributeError</code> of an missing <code>__parameters__</code> attribute. This could happen
when inheriting certain generic classes – for example <code>typing.*</code> classes are affected.
(<code>[#217](python-attrs/cattrs#217) &lt;https://github.com/python-attrs/cattrs/issues/217&gt;</code>_)</li>
<li>Fix structuring of <code>enum.Enum</code> instances in <code>typing.Literal</code> types.
(<code>[#231](python-attrs/cattrs#231) &lt;https://github.com/python-attrs/cattrs/pull/231&gt;</code>_)</li>
<li>Fix unstructuring all tuples - unannotated, variable-length, homogenous and heterogenous - to <code>list</code>.
(<code>[#226](python-attrs/cattrs#226) &lt;https://github.com/python-attrs/cattrs/issues/226&gt;</code>_)</li>
<li>For <code>forbid_extra_keys</code> raise custom <code>ForbiddenExtraKeyError</code> instead of generic <code>Exception</code>.
(<code>[#225](python-attrs/cattrs#225) &lt;https://github.com/python-attrs/cattrs/pull/225&gt;</code>_)</li>
<li>All preconf converters now support <code>loads</code> and <code>dumps</code> directly. See an example <code>here &lt;https://cattrs.readthedocs.io/en/latest/preconf.html&gt;</code>_.</li>
</ul>

</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/python-attrs/cattrs/commit/405f0291b958ae9eb45ee38febeb91fb65dd644f"><code>405f029</code></a> v22.2.0</li>
<li><a href="https://github.com/python-attrs/cattrs/commit/89de04f57aa774d6abfb0ae62517dc8a8064e3c2"><code>89de04f</code></a> Fix some mor</li>
<li><a href="https://github.com/python-attrs/cattrs/commit/0abbf271461babca203862f3581c20743f6118e0"><code>0abbf27</code></a> Fix tests</li>
<li><a href="https://github.com/python-attrs/cattrs/commit/3b750439aec826a8fd20976ca113f30a27e75408"><code>3b75043</code></a> <strong>notes</strong> is list[str]</li>
<li><a href="https://github.com/python-attrs/cattrs/commit/906b95cfef4903e2d6247abf0fdd72f7da21617a"><code>906b95c</code></a> Reorder HISTORY</li>
<li><a href="https://github.com/python-attrs/cattrs/commit/ed7f86a0ccd9adeab895b9afac2dea69fa02bcff"><code>ed7f86a</code></a> Improve NewTypes (<a href="https://github-redirect.dependabot.com/python-attrs/cattrs/issues/310">#310</a>)</li>
<li><a href="https://github.com/python-attrs/cattrs/commit/e7926599ad44e07d8325ae4072626e1a24705542"><code>e792659</code></a> Fix missing imports of preconf converters (<a href="https://github-redirect.dependabot.com/python-attrs/cattrs/issues/309">#309</a>)</li>
<li><a href="https://github.com/python-attrs/cattrs/commit/e425d6378aa8dfc74bbdd9e152365e1b962fd8cf"><code>e425d63</code></a> Reorder HISTORY</li>
<li><a href="https://github.com/python-attrs/cattrs/commit/cc56b2b873852a4e91b16706a39da00755c87759"><code>cc56b2b</code></a> Remove spurious type comment</li>
<li><a href="https://github.com/python-attrs/cattrs/commit/cbd6f29d2c0ebc40805b3ca0d81accfc330eb10c"><code>cbd6f29</code></a> Reformat</li>
<li>Additional commits viewable in <a href="https://github.com/python-attrs/cattrs/compare/v1.8.0...v22.2.0">compare view</a></li>
</ul>
</details>
<br />


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