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Fix the int.__pow__ plugin #7632

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Merged
merged 3 commits into from
Oct 5, 2019
Merged

Fix the int.__pow__ plugin #7632

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44718b8
Fix the int.__pow__ plugin
msullivan Oct 4, 2019
f7ba6c7
fix test, add test
msullivan Oct 5, 2019
a6b494a
sigh
msullivan Oct 5, 2019
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6 changes: 4 additions & 2 deletions mypy/plugins/default.py
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Original file line number Diff line number Diff line change
Expand Up @@ -365,8 +365,10 @@ def typed_dict_update_signature_callback(ctx: MethodSigContext) -> CallableType:

def int_pow_callback(ctx: MethodContext) -> Type:
"""Infer a more precise return type for int.__pow__."""
if (len(ctx.arg_types) == 1
and len(ctx.arg_types[0]) == 1):
# int.__pow__ has an optional modulo argument,
# so we expect 2 argument positions
if (len(ctx.arg_types) == 2
and len(ctx.arg_types[0]) == 1 and len(ctx.arg_types[1]) == 0):
arg = ctx.args[0][0]
if isinstance(arg, IntExpr):
exponent = arg.value
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