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python36Packages.black: fix broken dependency

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In PR #96456, black was upgraded from 19.10b0 to 20.8b1.  This new version of
black depends on the dataclasses module, but that was only introduced into the
standard library in Python 3.7; earlier versions of Python require the backport
package of the same name.  This commit addresses the missing dependency.
This commit is contained in:
Keshav Kini 2020-12-10 18:20:58 -08:00 committed by Frederik Rietdijk
parent 5103ebd8b8
commit fe5f82fd99
1 changed files with 2 additions and 1 deletions
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pkgs/development/python-modules/black/default.nix
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@ -5,6 +5,7 @@
, appdirs , appdirs
, attrs , attrs
, click , click
, dataclasses
, mypy-extensions , mypy-extensions
, pathspec , pathspec
, regex , regex
@ -59,7 +60,7 @@ buildPythonPackage rec {
toml toml
typed-ast typed-ast
typing-extensions typing-extensions
]; ] ++ lib.optional (pythonOlder "3.7") dataclasses;
meta = with lib; { meta = with lib; {
description = "The uncompromising Python code formatter"; description = "The uncompromising Python code formatter";