Isolate command line tests from user-level config (#2851)

[etc/vim.git] / docs / faq.md

diff --git a/docs/faq.md b/docs/faq.md
index ac5ba937c1c2f4501dc7bb87428ba90687fb5048..264141e3f39c61b014ee6322e26ec59b4abebbf4 100644 (file)
--- a/docs/faq.md
+++ b/docs/faq.md
@@ -5,6 +5,7 @@ The most common questions and issues users face are aggregated to this FAQ.
 ```{contents}
 :local:
 :backlinks: none
+:class: this-will-duplicate-information-and-it-is-still-useful-here
 ```
 
 ## Does Black have an API?
@@ -16,9 +17,8 @@ though.
 
 ## Is Black safe to use?
 
-Yes, for the most part. _Black_ is strictly about formatting, nothing else. But because
-_Black_ is still in [beta](index.rst), some edges are still a bit rough. To combat
-issues, the equivalence of code after formatting is
+Yes. _Black_ is strictly about formatting, nothing else. Black strives to ensure that
+after formatting the AST is
 [checked](the_black_code_style/current_style.md#ast-before-and-after-formatting) with
 limited special cases where the code is allowed to differ. If issues are found, an error
 is raised and the file is left untouched. Magical comments that influence linters and
@@ -26,10 +26,12 @@ other tools, such as `# noqa`, may be moved by _Black_. See below for more detai
 
 ## How stable is Black's style?
 
-Quite stable. _Black_ aims to enforce one style and one style only, with some room for
-pragmatism. However, _Black_ is still in beta so style changes are both planned and
-still proposed on the issue tracker. See
-[The Black Code Style](the_black_code_style/index.rst) for more details.
+Stable. _Black_ aims to enforce one style and one style only, with some room for
+pragmatism. See [The Black Code Style](the_black_code_style/index.rst) for more details.
+
+Starting in 2022, the formatting output will be stable for the releases made in the same
+year (other than unintentional bugs). It is possible to opt-in to the latest formatting
+styles, using the `--preview` flag.
 
 ## Why is my file not formatted?
 
@@ -37,6 +39,30 @@ Most likely because it is ignored in `.gitignore` or excluded with configuration
 [file collection and discovery](usage_and_configuration/file_collection_and_discovery.md)
 for details.
 
+## Why is my Jupyter Notebook cell not formatted?
+
+_Black_ is timid about formatting Jupyter Notebooks. Cells containing any of the
+following will not be formatted:
+
+- automagics (e.g. `pip install black`)
+- non-Python cell magics (e.g. `%%writeline`)
+- multiline magics, e.g.:
+
+  ```python
+  %timeit f(1, \
+          2, \
+          3)
+  ```
+
+- code which `IPython`'s `TransformerManager` would transform magics into, e.g.:
+
+  ```python
+  get_ipython().system('ls')
+  ```
+
+- invalid syntax, as it can't be safely distinguished from automagics in the absence of
+  a running `IPython` kernel.
+
 ## Why are Flake8's E203 and W503 violated?
 
 Because they go against PEP 8. E203 falsely triggers on list
@@ -45,12 +71,16 @@ readability because operators are misaligned. Disable W503 and enable the
 disabled-by-default counterpart W504. E203 should be disabled while changes are still
 [discussed](https://github.com/PyCQA/pycodestyle/issues/373).
 
-## Does Black support Python 2?
+## Which Python versions does Black support?
+
+Currently the runtime requires Python 3.6-3.10. Formatting is supported for files
+containing syntax from Python 3.3 to 3.10. We promise to support at least all Python
+versions that have not reached their end of life. This is the case for both running
+_Black_ and formatting code.
 
-For formatting, yes! [Install](getting_started.md#installation) with the `python2` extra
-to format Python 2 files too! There are no current plans to drop support, but most
-likely it is bound to happen. Sometime. Eventually. In terms of running _Black_ though,
-Python 3.6 or newer is required.
+Support for formatting Python 2 code was removed in version 22.0. While we've made no
+plans to stop supporting older Python 3 minor versions immediately, their support might
+also be removed some time in the future without a deprecation period.
 
 ## Why does my linter or typechecker complain after I format my code?
 
@@ -59,3 +89,14 @@ influence their behavior. While Black does its best to recognize such comments a
 them in the right place, this detection is not and cannot be perfect. Therefore, you'll
 sometimes have to manually move these comments to the right place after you format your
 codebase with _Black_.
+
+## Can I run Black with PyPy?
+
+Yes, there is support for PyPy 3.7 and higher.
+
+## Why does Black not detect syntax errors in my code?
+
+_Black_ is an autoformatter, not a Python linter or interpreter. Detecting all syntax
+errors is not a goal. It can format all code accepted by CPython (if you find an example
+where that doesn't hold, please report a bug!), but it may also format some code that
+CPython doesn't accept.