This indicates at least for people using type checkers that these
classes are not designed for inheritance and we make no stability
guarantees regarding inheritance of them.
Currently this doesn't show up in the docs. Sphinx does actually support
`@final`, however it only works when imported directly from `typing`,
while we import from `_pytest.compat`.
In the future there might also be a `@sealed` decorator which would
cover some more cases.
`TerminalWriter`, imported recently from `py`, contains its own
incomplete wcwidth (`char_with`/`get_line_width`) implementation. The
`TerminalReporter` also needs this, but uses the external `wcwidth`
package.
This commit brings the `TerminalWriter` implementation up-to-par with
`wcwidth`, moves to implementation to a new file `_pytest._io.wcwidth`
which is used everywhere, and removes the dependency.
The differences compared to the `wcwidth` package are:
- Normalizes the string before counting.
- Uses Python's `unicodedata` instead of vendored Unicode tables. This
means the data corresponds to the Python's version Unicode version
instead of the `wcwidth`'s package version.
- Apply some optimizations.
Currently this property is computed eagerly, which means
get_line_width() is computed on everything written, but that is a slow
function.
Compute it lazily, so that get_line_width() only runs when needed.
Flushing on every write is somewhat expensive.
Rely on line buffering instead (if line buffering for stdout is
disabled, there must be some reason...), and add explicit flushes when
not outputting lines.
This is how regular `print()` e.g. work so should be familiar.
* Use code highlighting if pygments is installed
* Use colorama constants instead of bare ascii codes
Could not find the exact equivalent of 'hl-reset' code using colorama
constants though.
* Refactor ASCII color handling into a fixture
* Revert back to using explicit color codes
* In Python 3.5 skip rest of tests that require ordered markup in colored output
This causes INTERNALERRORs with pytest-django, which uses
`pytest.fail` (derived from `BaseException`) to prevent DB access, when
pytest then tries to e.g. display the `repr()` for a Django `QuerySet`
etc.
Ref: https://github.com/pytest-dev/pytest-django/pull/776
This function is not called anywhere directly, and cannot be called by
the dynamic `repr_<type>()` dispatch mechanism because unicode is no
longer a type in Python 3.
