Python 3.10 is still in development. 3.10.0b3 is the third of four planned beta release previews. Beta release previews are intended to give the wider community the opportunity to test new features and bug fixes and to prepare their projects to support the new feature release.

While the release is planned to be feature complete entering the beta phase, it is possible that features may be modified or, in rare cases, deleted up until the start of the release candidate phase.

Major new features of the 3.10 series, compared to 3.9

Many new features for Python 3.10 are still being planned and written. Among the new major new features and changes so far:

• PEP 623 – Deprecate and prepare for the removal of the wstr member in PyUnicodeObject.
• PEP 604 – Allow writing union types as X | Y
• PEP 612 – Parameter Specification Variables
• PEP 626 – Precise line numbers for debugging and other tools.
• PEP 618 – Add Optional Length-Checking To zip.
• bpo-12782: Parenthesized context managers are now officially allowed.
• PEP 632 – Deprecate distutils module.
• PEP 613 – Explicit Type Aliases
• PEP 634 – Structural Pattern Matching: Specification
• PEP 635 – Structural Pattern Matching: Motivation and Rationale
• PEP 636 – Structural Pattern Matching: Tutorial
• PEP 644 – Require OpenSSL 1.1.1 or newer
• PEP 624 – Remove Py_UNICODE encoder APIs
• PEP 597 – Add optional EncodingWarning