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Python Type Hints
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José Padilla
March 15, 2018
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Python Type Hints
5min talk on Python Type Hints. Presented at newhaven.io
José Padilla
March 15, 2018
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Transcript
Type Hints
José Padilla
Work Training
Work Open Source
PEP 3107
None
PEP 484
None
no type checking happens at runtime
static analysis refactoring runtime type checking code generation
static analysis refactoring runtime type checking code generation
None
Common built-in types
None
None
None
None
None
None
None
None
None
None
None
None
None
Generics
None
None
mypy
static type checker
$ pip install mypy
$ python app.py
None
$ python app.py f 1 Traceback (most recent call last):
File "app.py", line 12, in <module> print(first(1)) # TypeError File "app.py", line 7, in first return seq[0] TypeError: 'int' object is not subscriptable
$ mypy app.py
$ mypy app.py main.py:12: error: Argument 1 to "first" has
incompatible type "int"; expected "Sequence[<nothing>]"
None
mypy-lang.org
Python will remain a dynamically typed language
Thanks! jpadilla.com twitter.com/@jpadilla_ github.com/jpadilla