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JelleZijlstra

opened on Oct 25, 2022

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The array.array class has been marked as generic in typeshed since 2017 (python/typeshed#1649). We just got a report on mypy (python/mypy#13942) pointing out that the class is not subscriptable at runtime. Just like other generic standard library classes, we should make array.array subscriptable at runtime (PEP-585).

I'll make a PR.

Reacted by Alex Waygood, Stefano Gogioso, LeeeeT, Oliver Wilkes and Vamshee Teja

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1. JelleZijlstra

   added

   type-featureA feature request or enhancementA feature request or enhancement

   topic-typing

   on Oct 25, 2022
2. JelleZijlstra

   added a commit that references this issue on Oct 25, 2022

   pythongh-98658: Add __class_getitem__ to array.array

   b41bf73
3. serhiy-storchaka commented on Oct 26, 2022

   

   serhiy-storchaka

   on Oct 26, 2022

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   Isn't it a bug in typeshed? This class does not look generic.
4. JelleZijlstra commented on Oct 27, 2022

   

   JelleZijlstra

   on Oct 27, 2022

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   It's marked as generic because the "element" type depends on the type code:

   In [50]: a1=array.array('b', [1])
   
   In [51]: a1[0]
   Out[51]: 1
   
   In [52]: a2 = array.array('f', [1])
   
   In [53]: a2[0]
   Out[53]: 1.0
   

   So we'd want a1 to be typed as an array[int] and a2 as an array[float].
5. serhiy-storchaka commented on Oct 27, 2022

   

   serhiy-storchaka

   on Oct 27, 2022

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   It makes sense.
6. JelleZijlstra

   closed this as completedin 5cf317aon Nov 1, 2022
7. serhiy-storchaka

   added this to Struct, memoryview and array issues 🏗️on Jul 13, 2026
8. github-project-automation

   moved this from Todo to Done in Struct, memoryview and array issues 🏗️on Jul 13, 2026
9. github-project-automation

   moved this to Todo in Struct, memoryview and array issues 🏗️on Jul 13, 2026
10. serhiy-storchaka

    added a commit that references this issue on Aug 9, 2026

    pythongh-98658: Add __class_getitem__ to array.array (python#98661)

    5cf317a

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