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Thetyping_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, buttyping_extensions allowsusers on previous Python versions to use it too.
• Enable experimentation with new type system PEPs before they are accepted andadded to thetyping module.

typing_extensions is treated specially by static type checkers such asmypy and pyright. Objects defined intyping_extensions are treated the sameway as equivalent forms intyping.

typing_extensions usesSemantic Versioning. Themajor version will be incremented only for backwards-incompatible changes.Therefore, it's safe to dependontyping_extensions like this:typing_extensions ~=x.y,wherex.y is the first version that includes all features you need.Thisis equivalent totyping_extensions >=x.y, <(x+1). Do not depend on~= x.y.zunless you really know what you're doing; that defeats the purpose ofsemantic versioning.

Seethe documentation for acomplete listing of module contents.

SeeCONTRIBUTING.mdfor how to contribute totyping_extensions.