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Store the type for assignment expr targets #9479

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merged 3 commits into from Sep 27, 2020
Merged

Store the type for assignment expr targets #9479

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62f054c
Store the type for assignment expr targets
llchan Sep 24, 2020
c20c346
Add another walrus expr test
llchan Sep 25, 2020
0d3cfdd
Only apply walrus type propagation if inhabited
llchan Sep 25, 2020
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3 changes: 3 additions & 0 deletions mypy/checkexpr.py
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Expand Up @@ -3788,6 +3788,9 @@ def accept(self,
assert typ is not None
self.chk.store_type(node, typ)

if isinstance(node, AssignmentExpr) and not has_uninhabited_component(typ):
self.chk.store_type(node.target, typ)

if (self.chk.options.disallow_any_expr and
not always_allow_any and
not self.chk.is_stub and
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10 changes: 10 additions & 0 deletions test-data/unit/check-python38.test
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Expand Up @@ -377,3 +377,13 @@ def check_partial_list() -> None:
z.append(3)
reveal_type(z) # N: Revealed type is 'builtins.list[builtins.int]'
[builtins fixtures/list.pyi]

[case testWalrusExpr]
def func() -> None:
foo = Foo()
if x := foo.x:
pass

class Foo:
def __init__(self) -> None:
self.x = 123