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Fix an embarrassing UnboundLocalError
[etc/vim.git] / README.md
diff --git a/README.md b/README.md
index 5c042159665f7570dedf37233bec2a53e7664e6f..06b732466eb3b305307992f35a23df99cc476956 100644 (file)
--- a/README.md
+++ b/README.md
@@ -300,6 +300,22 @@ This behaviour may raise ``W503 line break before binary operator`` warnings in
 style guide enforcement tools like Flake8. Since ``W503`` is not PEP 8 compliant,
 you should tell Flake8 to ignore these warnings.
 
+### Parentheses
+
+Some parentheses are optional in the Python grammar.  Any expression can
+be wrapped in a pair of parentheses to form an atom.  There are a few
+interesting cases:
+
+- `if (...):`
+- `while (...):`
+- `for (...) in (...):`
+- `assert (...), (...)`
+- `from X import (...)`
+
+In those cases, parentheses are removed when the entire statement fits
+in one line, or if the inner expression doesn't have any delimiters to
+further split on.  Otherwise, the parentheses are always added.
+
 
 ## Editor integration
 
@@ -316,14 +332,16 @@ Use [proofit404/blacken](https://github.com/proofit404/blacken).
 
 2. Locate your `black` installation folder.
 
-        $ which black         # MacOS/Linux
+  On MacOS / Linux / BSD:
+
+        $ which black
         /usr/local/bin/black  # possible location
 
-       <!-->
+  On Windows:
 
-        $ where black         # Windows
+        $ where black
         %LocalAppData%\Programs\Python\Python36-32\Scripts\black.exe  # possible location
-        
+
 3. Open External tools in PyCharm with `File -> Settings -> Tools -> External Tools`.
 
 4. Click the + icon to add a new external tool with the following values:
@@ -477,6 +495,8 @@ More details can be found in [CONTRIBUTING](CONTRIBUTING.md).
 
 * added `--quiet` (#78)
 
+* added automatic parentheses management (#4)
+
 * added [pre-commit](https://pre-commit.com) integration (#103, #104)
 
 * fixed reporting on `--check` with multiple files (#101, #102)
@@ -608,8 +628,9 @@ More details can be found in [CONTRIBUTING](CONTRIBUTING.md).
 Glued together by [Łukasz Langa](mailto:lukasz@langa.pl).
 
 Maintained with [Carol Willing](mailto:carolcode@willingconsulting.com),
-[Carl Meyer](mailto:carl@oddbird.net), and
-[Mika Naylor](mailto:mail@autophagy.io).
+[Carl Meyer](mailto:carl@oddbird.net),
+[Mika Naylor](mailto:mail@autophagy.io), and
+[Zsolt Dollenstein](mailto:zsol.zsol@gmail.com).
 
 Multiple contributions by:
 * [Anthony Sottile](mailto:asottile@umich.edu)
@@ -619,4 +640,3 @@ Multiple contributions by:
 * Hugo van Kemenade
 * [Ivan Katanić](mailto:ivan.katanic@gmail.com)
 * [Osaetin Daniel](mailto:osaetindaniel@gmail.com)
-* [Zsolt Dollenstein](mailto:zsol.zsol@gmail.com)
vim configuration

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