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1.3 KiB
1.3 KiB
Builtins
Importing builtin module
Builtin symbols can be explicitly imported:
import builtins
reveal_type(builtins.chr) # revealed: def chr(i: SupportsIndex, /) -> str
Implicit use of builtin
Or used implicitly:
reveal_type(chr) # revealed: def chr(i: SupportsIndex, /) -> str
reveal_type(str) # revealed: <class 'str'>
Builtin symbol from custom typeshed
If we specify a custom typeshed, we can use the builtin symbol from it, and no longer access the builtins from the "actual" vendored typeshed:
[environment]
typeshed = "/typeshed"
/typeshed/stdlib/builtins.pyi:
class Custom: ...
custom_builtin: Custom
/typeshed/stdlib/typing_extensions.pyi:
def reveal_type(obj, /): ...
reveal_type(custom_builtin) # revealed: Custom
# error: [unresolved-reference]
reveal_type(str) # revealed: Unknown
Unknown builtin (later defined)
foo has a type of Unknown in this example, as it relies on bar which has not been defined at
that point:
[environment]
typeshed = "/typeshed"
/typeshed/stdlib/builtins.pyi:
foo = bar
bar = 1
/typeshed/stdlib/typing_extensions.pyi:
def reveal_type(obj, /): ...
reveal_type(foo) # revealed: Unknown