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Introduction on Typing Protocol Runtime Checkable Intermediate Anthony Explains 187
today I show you what the `TYPE_CHECKING` constant is in the today I talk about why I pick -˃ int for return values for main functions instead of -˃ None (which works)! - testable command lines: ... today we go over narrowings and `TypeGuard` -- which enables you to write your own user-defined narrowings! playlist: ... today I talk about the difference between object and Any when today I talk about how to package up typed code -- either inline types or today I talk about the several uses of Final / when
today I talk about why mypy doesn't need an annotation for the first argument! - introduction to today I show the tools and processes I used to improve python startup in virtualenvs! - pretty python profiling: ... today we talk about mypy's "implicit optional" and why I think it's better to not use it! - what is Optional: ...
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Last Updated: June 6, 2026
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typing: Protocol + @runtime_checkable (intermediate) anthony explains #187
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python typing: Generator[T, S, R] (intermediate) anthony explains #297
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typing Self (PEP 673) (intermediate) anthony explains #418
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structural subtyping in python with Protocol! (intermediate) anthony explains #164
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python typing: Generator[T, S, R] anthony explains #297
typing Self anthony explains #418
structural subtyping in python with Protocol! anthony explains #164
python typing: TYPE_CHECKING anthony explains #312
gradual typing python anthony explains #308
typing: why main -˃ int anthony explains #110
python TypeGuard anthony explains #439
python typing: object vs Any anthony explains #275
opinion: don't bother typing tests anthony explains #347
python typing: explicit TypeAlias anthony explains #365
packaging python typed code anthony explains #252
debugging mypy types anthony explains #299
python typing: Final / @final anthony explains #132
python typing: why not self? anthony explains #076
python Generics anthony explains #430
python typing: Optional is not optional! anthony explains #146
how I sped up python by 20ms anthony explains #417
is python with types faster? anthony explains #126
