Web Reference: In line with other type-hinted languages, the preferred (and more concise) way to denote an optional argument in Python 3.10 and up, is now Type | None, e.g. str | None or list | None. 1 day ago · Type-checker-agnostic documentation written by the community detailing type system features, useful typing related tools and typing best practices. The canonical, up-to-date specification of the Python type system can be found at Specification for the Python type system. Feb 19, 2024 · In this guide, we’ll delve into what the optional type is, why it matters, and how to effectively use it in Python, complete with examples. The Optional type is a way to denote that a variable or a return type could either have a specified type or be None.
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