- update to 18.9b0
* numeric literals are now formatted by Black
* numeric literals are normalized to include _ separators on Python 3.6+ code
* added --skip-numeric-underscore-normalization to disable the above behavior
and leave numeric underscores as they were in the input
* code with _ in numeric literals is recognized as Python 3.6+
* most letters in numeric literals are lowercased (e.g., in 1e10, 0x01)
* hexadecimal digits are always uppercased (e.g. 0xBADC0DE)
* added blackd, see its documentation for more info
* adjacent string literals are now correctly split into multiple lines
* trailing comma is now added to single imports that don't fit on a line
* cache is now populated when --check is successful for a file which
speeds up consecutive checks of properly formatted unmodified files
* whitespace at the beginning of the file is now removed
* fixed mangling pweave and Spyder IDE special comments
* fixed unstable formatting when unpacking big tuples
* fixed parsing of __future__ imports with renames
* fixed scope of # fmt: off when directly preceding yield and other nodes
* fixed formatting of lambda expressions with default arguments
* fixed async for statements: Black no longer breaks them into separate lines
* note: the Vim plugin stopped registering ,= as a default chord
as it turned out to be a bad idea