Release Date: June 12, 2018

Python 3.6.6rc1 is a release candidate preview of the sixth maintenance release of Python 3.6. The Python 3.6 series contains many new features and optimizations.

Among the new major new features in Python 3.6 are:

• PEP 468, Preserving Keyword Argument Order
• PEP 487, Simpler customization of class creation
• PEP 495, Local Time Disambiguation
• PEP 498, Literal String Formatting
• PEP 506, Adding A Secrets Module To The Standard Library
• PEP 509, Add a private version to dict
• PEP 515, Underscores in Numeric Literals
• PEP 519, Adding a file system path protocol
• PEP 520, Preserving Class Attribute Definition Order
• PEP 523, Adding a frame evaluation API to CPython
• PEP 524, Make os.urandom() blocking on Linux (during system startup)
• PEP 525, Asynchronous Generators (provisional)
• PEP 526, Syntax for Variable Annotations (provisional)
• PEP 528, Change Windows console encoding to UTF-8
• PEP 529, Change Windows filesystem encoding to UTF-8
• PEP 530, Asynchronous Comprehensions

Please see What’s New In Python 3.6 for more information. Note that 3.6.6rc1 is a preview release and thus its use is not recommended for production environments.

Full Changelog