Typing Extensions
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Overview
The typing_extensions module serves two related purposes:
Enable use of new type system features on older Python versions. For example, typing.TypeGuard is new in Python 3.10, but typing_extensions allows users on previous Python versions to use it too.
Enable experimentation with new type system PEPs before they are accepted and added to the typing module.
typing_extensions is treated specially by static type checkers such as mypy and pyright. Objects defined in typing_extensions are treated the same way as equivalent forms in typing.
typing_extensions uses
. The major version will be incremented only for backwards-incompatible changes. Therefore, it's safe to depend on typing_extensions like this: typing_extensions ~=x.y, where x.y is the first version that includes all features you need.
is equivalent to typing_extensions >=x.y, <(x+1). Do not depend on ~= x.y.z unless you really know what you're doing; that defeats the purpose of semantic versioning.
Included items
See
for a complete listing of module contents.
Contributing
See
for how to contribute to typing_extensions.