Use is_number_token instead of assertion (#3069)

[etc/vim.git] / docs / the_black_code_style / future_style.md

diff --git a/docs/the_black_code_style/future_style.md b/docs/the_black_code_style/future_style.md
index 70ffeefc76afe961307b51e0f169673a25d0dca8..8d159e9b0a21cf0890934b56f48e8f1931901ca6 100644 (file)
--- a/docs/the_black_code_style/future_style.md
+++ b/docs/the_black_code_style/future_style.md
@@ -34,15 +34,43 @@ with \
 Although when the target version is Python 3.9 or higher, _Black_ will use parentheses
 instead since they're allowed in Python 3.9 and higher.
 
-## Improved string processing
-
-Currently, _Black_ does not split long strings to fit the line length limit. Currently,
-there is [an experimental option](labels/experimental-string) to enable splitting
-strings. We plan to enable this option by default once it is fully stable. This is
-tracked in [this issue](https://github.com/psf/black/issues/2188).
-
 ## Preview style
 
 Experimental, potentially disruptive style changes are gathered under the `--preview`
 CLI flag. At the end of each year, these changes may be adopted into the default style,
-as described in [The Black Code Style](./index.rst).
+as described in [The Black Code Style](./index.rst). Because the functionality is
+experimental, feedback and issue reports are highly encouraged!
+
+### Improved string processing
+
+_Black_ will split long string literals and merge short ones. Parentheses are used where
+appropriate. When split, parts of f-strings that don't need formatting are converted to
+plain strings. User-made splits are respected when they do not exceed the line length
+limit. Line continuation backslashes are converted into parenthesized strings.
+Unnecessary parentheses are stripped. The stability and status of this feature is
+tracked in [this issue](https://github.com/psf/black/issues/2188).
+
+### Removing trailing newlines after code block open
+
+_Black_ will remove trailing newlines after code block openings. That means that the
+following code:
+
+```python
+def my_func():
+
+    print("The line above me will be deleted!")
+
+    print("But the line above me won't!")
+```
+
+Will be changed to:
+
+```python
+def my_func():
+    print("The line above me will be deleted!")
+
+    print("But the line above me won't!")
+```
+
+This new feature will be applied to **all code blocks**: `def`, `class`, `if`, `for`,
+`while`, `with`, `case` and `match`.