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Use (simplified) unions instead of joins for tuple fallbacks #17408

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Merged
merged 7 commits into from
Jun 22, 2024
Merged

Use (simplified) unions instead of joins for tuple fallbacks #17408

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66ce501
Use (simplified) unions instead of joins for tuple fallbacks
ilevkivskyi Jun 20, 2024
59ab31c
Add some shortening for long unions
ilevkivskyi Jun 22, 2024
8d69bc1
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Jun 22, 2024
8b8b543
Add a note about problematic subtype items
ilevkivskyi Jun 22, 2024
18c921e
Use simpler wording
ilevkivskyi Jun 22, 2024
a32b49a
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Jun 22, 2024
23a5d03
Apply suggestions from code review
ilevkivskyi Jun 22, 2024
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Use simpler wording
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@ilevkivskyi
ilevkivskyi committed Jun 22, 2024
commit 18c921e6412322fc652c16f25b8549d4f182d1c4
4 changes: 3 additions & 1 deletion mypy/messages.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3212,7 +3212,9 @@ def append_union_note(
non_matching.append(item)
if non_matching:
types = ", ".join([format_type(typ, options) for typ in non_matching])
notes.append(f"Subtype item{plural_s(types)} that may cause the mismatch: {types}")
notes.append(
f"Item{plural_s(non_matching)} in the first union not in the second: {types}"
)
return notes


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4 changes: 2 additions & 2 deletions test-data/unit/check-unions.test
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Expand Up @@ -1325,7 +1325,7 @@ class C10: ...
x: Union[C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, int]
y: Union[C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, str]
x = y # E: Incompatible types in assignment (expression has type "Union[C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, str]", variable has type "Union[C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, int]") \
# N: Subtype items that may cause the mismatch: "str"
# N: Item in the first union not in the second: "str"

[case testLargeUnionsNoneShown]
from typing import Union
Expand All @@ -1345,4 +1345,4 @@ class C11: ...
x: Union[C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11]
y: Union[C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, None]
x = y # E: Incompatible types in assignment (expression has type "Union[C1, C2, C3, C4, C5, <6 more items>, None]", variable has type "Union[C1, C2, C3, C4, C5, <6 more items>]") \
# N: Subtype items that may cause the mismatch: "None"
# N: Item in the first union not in the second: "None"
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