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what's new in python 3.7 changelog python 3.7

tl;dr

  • Solve annotations dependency, calling Class that will be define later by postponing their resolution for last minute.

  • Added a dataclass decorator, using it on a class with field will generate by default the magic functions (init, repr, eq, lt, le, gt, ge) can also specifiy if field are hashable or read only

  • Add contextvars, powerful function to create variable that can be access "globally" as long they are still in the context they were set, really useful for asynchronous operation

  • async and await are now reserved keywords

  • Fix Union bug where Union[ParentClass, ChildrenClass] was simplified to Union[ParentClass].

  • Change handling of DepreciationWarning, now it's only displayed when functions containing it are call in main or during test.
    Also add FutureWarning that will alway be displayed by default and PendindDepreciationWarning for test only

  • Now time work with nanoseconds, 6 new _ns functions are added to use it preperly.

  • New documentation work in Japonese, French and Korean

  • Least but not last datetime object can now convert back iso format with function fromisoformat.

Afterword

Overall lot of bug fix and improvement for cython and c api and less new features but the focus on asynchronous operations and typing seem to prepare for a safer and more performant python.