Update coverage to 5.0.1

[pyup-bot]

This PR updates coverage from 4.4.1 to 5.0.1.

Changelog

5.0.1

----------------------------

- If a 4.x data file is the cause of a "file is not a database" error, then use
a more specific error message, "Looks like a coverage 4.x data file, are you
mixing versions of coverage?"  Helps diagnose the problems described in
`issue 886`_.

- Measurement contexts and relative file names didn't work together, as
reported in `issue 899`_ and `issue 900`_.  This is now fixed, thanks to
David Szotten.

- When using ``coverage run --concurrency=multiprocessing``, all data files
should be named with parallel-ready suffixes.  5.0 mistakenly named the main
process' file with no suffix when using ``--append``.  This is now fixed,
closing `issue 880`_.

- Fixed a problem on Windows when the current directory is changed to a
different drive (`issue 895`_).  Thanks, Olivier Grisel.

- Updated Python 3.9 support to 3.9a2.

.. _issue 880: https://github.com/nedbat/coveragepy/issues/880
.. _issue 886: https://github.com/nedbat/coveragepy/issues/886
.. _issue 895: https://github.com/nedbat/coveragepy/issues/895
.. _issue 899: https://github.com/nedbat/coveragepy/issues/899
.. _issue 900: https://github.com/nedbat/coveragepy/issues/900


.. _changes_50:

5.0

--------------------------

Nothing new beyond 5.0b2.


.. _changes_50b2:

5.0b2

----------------------------

- An experimental ``[run] relative_files`` setting tells coverage to store
relative file names in the data file. This makes it easier to run tests in
one (or many) environments, and then report in another.  It has not had much
real-world testing, so it may change in incompatible ways in the future.

- When constructing a :class:`coverage.Coverage` object, `data_file` can be
specified as None to prevent writing any data file at all.  In previous
versions, an explicit `data_file=None` argument would use the default of
".coverage". Fixes `issue 871`_.

- Python files run with ``-m`` now have ``__spec__`` defined properly.  This
fixes `issue 745`_ (about not being able to run unittest tests that spawn
subprocesses), and `issue 838`_, which described the problem directly.

- The ``[paths]`` configuration section is now ordered. If you specify more
than one list of patterns, the first one that matches will be used.  Fixes
`issue 649`_.

- The :func:`.coverage.numbits.register_sqlite_functions` function now also
registers `numbits_to_nums` for use in SQLite queries.  Thanks, Simon
Willison.

- Python 3.9a1 is supported.

- Coverage.py has a mascot: :ref:`Sleepy Snake <sleepy>`.

.. _issue 649: https://github.com/nedbat/coveragepy/issues/649
.. _issue 745: https://github.com/nedbat/coveragepy/issues/745
.. _issue 838: https://github.com/nedbat/coveragepy/issues/838
.. _issue 871: https://github.com/nedbat/coveragepy/issues/871


.. _changes_50b1:

5.0b1

----------------------------

- The HTML and textual reports now have a ``--skip-empty`` option that skips
files with no statements, notably ``__init__.py`` files.  Thanks, Reya B.

- Configuration can now be read from `TOML`_ files.  This requires installing
coverage.py with the ``[toml]`` extra.  The standard "pyproject.toml" file
will be read automatically if no other configuration file is found, with
settings in the ``[tool.coverage.]`` namespace.  Thanks to Frazer McLean for
implementation and persistence.  Finishes `issue 664`_.

- The ``[run] note`` setting has been deprecated. Using it will result in a
warning, and the note will not be written to the data file.  The
corresponding :class:`.CoverageData` methods have been removed.

- The HTML report has been reimplemented (no more table around the source
code). This allowed for a better presentation of the context information,
hopefully resolving `issue 855`_.

- Added sqlite3 module version information to ``coverage debug sys`` output.

- Asking the HTML report to show contexts (``[html] show_contexts=True`` or
``coverage html --show-contexts``) will issue a warning if there were no
contexts measured (`issue 851`_).

.. _TOML: https://github.com/toml-lang/tomlreadme
.. _issue 664: https://github.com/nedbat/coveragepy/issues/664
.. _issue 851: https://github.com/nedbat/coveragepy/issues/851
.. _issue 855: https://github.com/nedbat/coveragepy/issues/855


.. _changes_50a8:

5.0a8

----------------------------

- The :class:`.CoverageData` API has changed how queries are limited to
specific contexts.  Now you use :meth:`.CoverageData.set_query_context` to
set a single exact-match string, or :meth:`.CoverageData.set_query_contexts`
to set a list of regular expressions to match contexts.  This changes the
command-line ``--contexts`` option to use regular expressions instead of
filename-style wildcards.


.. _changes_50a7:

5.0a7

----------------------------

- Data can now be "reported" in JSON format, for programmatic use, as requested
in `issue 720`_.  The new ``coverage json`` command writes raw and summarized
data to a JSON file.  Thanks, Matt Bachmann.

- Dynamic contexts are now supported in the Python tracer, which is important
for PyPy users.  Closes `issue 846`_.

- The compact line number representation introduced in 5.0a6 is called a
"numbits."  The :mod:`coverage.numbits` module provides functions for working
with them.

- The reporting methods used to permanently apply their arguments to the
configuration of the Coverage object.  Now they no longer do.  The arguments
affect the operation of the method, but do not persist.

- A class named "test_something" no longer confuses the ``test_function``
dynamic context setting.  Fixes `issue 829`_.

- Fixed an unusual tokenizing issue with backslashes in comments.  Fixes
`issue 822`_.

- ``debug=plugin`` didn't properly support configuration or dynamic context
plugins, but now it does, closing `issue 834`_.

.. _issue 720: https://github.com/nedbat/coveragepy/issues/720
.. _issue 822: https://github.com/nedbat/coveragepy/issues/822
.. _issue 834: https://github.com/nedbat/coveragepy/issues/834
.. _issue 829: https://github.com/nedbat/coveragepy/issues/829
.. _issue 846: https://github.com/nedbat/coveragepy/issues/846


.. _changes_50a6:

5.0a6

----------------------------

- Reporting on contexts. Big thanks to Stephan Richter and Albertas Agejevas
for the contribution.

- The ``--contexts`` option is available on the ``report`` and ``html``
 commands.  It's a comma-separated list of shell-style wildcards, selecting
 the contexts to report on.  Only contexts matching one of the wildcards
 will be included in the report.

- The ``--show-contexts`` option for the ``html`` command adds context
 information to each covered line.  Hovering over the "ctx" marker at the
 end of the line reveals a list of the contexts that covered the line.

- Database changes:

- Line numbers are now stored in a much more compact way.  For each file and
 context, a single binary string is stored with a bit per line number.  This
 greatly improves memory use, but makes ad-hoc use difficult.

- Dynamic contexts with no data are no longer written to the database.

- SQLite data storage is now faster.  There's no longer a reason to keep the
 JSON data file code, so it has been removed.

- Changes to the :class:`.CoverageData` interface:

- The new :meth:`.CoverageData.dumps` method serializes the data to a string,
 and a corresponding :meth:`.CoverageData.loads` method reconstitutes this
 data.  The format of the data string is subject to change at any time, and
 so should only be used between two installations of the same version of
 coverage.py.

- The :meth:`CoverageData constructor<.CoverageData.__init__>` has a new
 argument, `no_disk` (default: False).  Setting it to True prevents writing
 any data to the disk.  This is useful for transient data objects.

- Added the classmethod :meth:`.Coverage.current` to get the latest started
Coverage instance.

- Multiprocessing support in Python 3.8 was broken, but is now fixed.  Closes
`issue 828`_.

- Error handling during reporting has changed slightly.  All reporting methods
now behave the same.  The ``--ignore-errors`` option keeps errors from
stopping the reporting, but files that couldn't parse as Python will always
be reported as warnings.  As with other warnings, you can suppress them with
the ``[run] disable_warnings`` configuration setting.

- Coverage.py no longer fails if the user program deletes its current
directory. Fixes `issue 806`_.  Thanks, Dan Hemberger.

- The scrollbar markers in the HTML report now accurately show the highlighted
lines, regardless of what categories of line are highlighted.

- The hack to accommodate ShiningPanda_ looking for an obsolete internal data
file has been removed, since ShiningPanda 0.22 fixed it four years ago.

- The deprecated `Reporter.file_reporters` property has been removed.

.. _ShiningPanda: https://wiki.jenkins.io/display/JENKINS/ShiningPanda+Plugin
.. _issue 806: https://github.com/nedbat/coveragepy/pull/806
.. _issue 828: https://github.com/nedbat/coveragepy/issues/828


.. _changes_50a5:

5.0a5

----------------------------

- Drop support for Python 3.4

- Dynamic contexts can now be set two new ways, both thanks to Justas
Sadzevičius.

- A plugin can implement a ``dynamic_context`` method to check frames for
 whether a new context should be started.  See
 :ref:`dynamic_context_plugins` for more details.

- Another tool (such as a test runner) can use the new
 :meth:`.Coverage.switch_context` method to explicitly change the context.

- The ``dynamic_context = test_function`` setting now works with Python 2
old-style classes, though it only reports the method name, not the class it
was defined on.  Closes `issue 797`_.

- ``fail_under`` values more than 100 are reported as errors.  Thanks to Mike
Fiedler for closing `issue 746`_.

- The "missing" values in the text output are now sorted by line number, so
that missing branches are reported near the other lines they affect. The
values used to show all missing lines, and then all missing branches.

- Access to the SQLite database used for data storage is now thread-safe.
Thanks, Stephan Richter. This closes `issue 702`_.

- Combining data stored in SQLite is now about twice as fast, fixing `issue
761`_.  Thanks, Stephan Richter.

- The ``filename`` attribute on :class:`.CoverageData` objects has been made
private.  You can use the ``data_filename`` method to get the actual file
name being used to store data, and the ``base_filename`` method to get the
original filename before parallelizing suffixes were added.  This is part of
fixing `issue 708`_.

- Line numbers in the HTML report now align properly with source lines, even
when Chrome's minimum font size is set, fixing `issue 748`_.  Thanks Wen Ye.

.. _issue 702: https://github.com/nedbat/coveragepy/issues/702
.. _issue 708: https://github.com/nedbat/coveragepy/issues/708
.. _issue 746: https://github.com/nedbat/coveragepy/issues/746
.. _issue 748: https://github.com/nedbat/coveragepy/issues/748
.. _issue 761: https://github.com/nedbat/coveragepy/issues/761
.. _issue 797: https://github.com/nedbat/coveragepy/issues/797


.. _changes_50a4:

5.0a4

----------------------------

- You can specify the command line to run your program with the ``[run]
command_line`` configuration setting, as requested in `issue 695`_.

- Coverage will create directories as needed for the data file if they don't
exist, closing `issue 721`_.

- The ``coverage run`` command has always adjusted the first entry in sys.path,
to properly emulate how Python runs your program.  Now this adjustment is
skipped if sys.path[0] is already different than Python's default.  This
fixes `issue 715`_.

- Improvements to context support:

- The "no such table: meta" error is fixed.: `issue 716`_.

- Combining data files is now much faster.

- Python 3.8 (as of today!) passes all tests.

.. _issue 695: https://github.com/nedbat/coveragepy/issues/695
.. _issue 715: https://github.com/nedbat/coveragepy/issues/715
.. _issue 716: https://github.com/nedbat/coveragepy/issues/716
.. _issue 721: https://github.com/nedbat/coveragepy/issues/721


.. _changes_50a3:

5.0a3

----------------------------

- Context support: static contexts let you specify a label for a coverage run,
which is recorded in the data, and retained when you combine files.  See
:ref:`contexts` for more information.

- Dynamic contexts: specifying ``[run] dynamic_context = test_function`` in the
config file will record the test function name as a dynamic context during
execution.  This is the core of "Who Tests What" (`issue 170`_).  Things to
note:

- There is no reporting support yet.  Use SQLite to query the .coverage file
 for information.  Ideas are welcome about how reporting could be extended
 to use this data.

- There's a noticeable slow-down before any test is run.

- Data files will now be roughly N times larger, where N is the number of
 tests you have.  Combining data files is therefore also N times slower.

- No other values for ``dynamic_context`` are recognized yet.  Let me know
 what else would be useful.  I'd like to use a pytest plugin to get better
 information directly from pytest, for example.

.. _issue 170: https://github.com/nedbat/coveragepy/issues/170

- Environment variable substitution in configuration files now supports two
syntaxes for controlling the behavior of undefined variables: if ``VARNAME``
is not defined, ``${VARNAME?}`` will raise an error, and ``${VARNAME-default
value}`` will use "default value".

- Partial support for Python 3.8, which has not yet released an alpha. Fixes
`issue 707`_ and `issue 714`_.

.. _issue 707: https://github.com/nedbat/coveragepy/issues/707
.. _issue 714: https://github.com/nedbat/coveragepy/issues/714


.. _changes_50a2:

5.0a2

----------------------------

- Coverage's data storage has changed.  In version 4.x, .coverage files were
basically JSON.  Now, they are SQLite databases.  This means the data file
can be created earlier than it used to.  A large amount of code was
refactored to support this change.

- Because the data file is created differently than previous releases, you
 may need ``parallel=true`` where you didn't before.

- The old data format is still available (for now) by setting the environment
 variable COVERAGE_STORAGE=json. Please tell me if you think you need to
 keep the JSON format.

- The database schema is guaranteed to change in the future, to support new
 features.  I'm looking for opinions about making the schema part of the
 public API to coverage.py or not.

- Development moved from `Bitbucket`_ to `GitHub`_.

- HTML files no longer have trailing and extra whitespace.

- The sort order in the HTML report is stored in local storage rather than
cookies, closing `issue 611`_.  Thanks, Federico Bond.

- pickle2json, for converting v3 data files to v4 data files, has been removed.

.. _Bitbucket: https://bitbucket.org/ned/coveragepy
.. _GitHub: https://github.com/nedbat/coveragepy

.. _issue 611: https://github.com/nedbat/coveragepy/issues/611


.. _changes_50a1:

5.0a1

----------------------------

- Coverage.py no longer supports Python 2.6 or 3.3.

- The location of the configuration file can now be specified with a
``COVERAGE_RCFILE`` environment variable, as requested in `issue 650`_.

- Namespace packages are supported on Python 3.7, where they used to cause
TypeErrors about path being None. Fixes `issue 700`_.

- A new warning (``already-imported``) is issued if measurable files have
already been imported before coverage.py started measurement.  See
:ref:`cmd_warnings` for more information.

- Running coverage many times for small runs in a single process should be
faster, closing `issue 625`_.  Thanks, David MacIver.

- Large HTML report pages load faster.  Thanks, Pankaj Pandey.

.. _issue 625: https://bitbucket.org/ned/coveragepy/issues/625/lstat-dominates-in-the-case-of-small
.. _issue 650: https://bitbucket.org/ned/coveragepy/issues/650/allow-setting-configuration-file-location
.. _issue 700: https://github.com/nedbat/coveragepy/issues/700


.. _changes_454:

4.5.4

---------------------------

- Multiprocessing support in Python 3.8 was broken, but is now fixed.  Closes
`issue 828`_.

.. _issue 828: https://github.com/nedbat/coveragepy/issues/828


.. _changes_453:

4.5.3

---------------------------

- Only packaging metadata changes.


.. _changes_452:

4.5.2

----------------------------

- Namespace packages are supported on Python 3.7, where they used to cause
TypeErrors about path being None. Fixes `issue 700`_.

- Python 3.8 (as of today!) passes all tests.  Fixes `issue 707`_ and
`issue 714`_.

- Development moved from `Bitbucket`_ to `GitHub`_.

.. _issue 700: https://github.com/nedbat/coveragepy/issues/700
.. _issue 707: https://github.com/nedbat/coveragepy/issues/707
.. _issue 714: https://github.com/nedbat/coveragepy/issues/714

.. _Bitbucket: https://bitbucket.org/ned/coveragepy
.. _GitHub: https://github.com/nedbat/coveragepy


.. _changes_451:

4.5.1

----------------------------

- Now that 4.5 properly separated the ``[run] omit`` and ``[report] omit``
settings, an old bug has become apparent.  If you specified a package name
for ``[run] source``, then omit patterns weren't matched inside that package.
This bug (`issue 638`_) is now fixed.

- On Python 3.7, reporting about a decorated function with no body other than a
docstring would crash coverage.py with an IndexError (`issue 640`_).  This is
now fixed.

- Configurer plugins are now reported in the output of ``--debug=sys``.

.. _issue 638: https://bitbucket.org/ned/coveragepy/issues/638/run-omit-is-ignored-since-45
.. _issue 640: https://bitbucket.org/ned/coveragepy/issues/640/indexerror-reporting-on-an-empty-decorated


.. _changes_45:

4.5

--------------------------

- A new kind of plugin is supported: configurers are invoked at start-up to
allow more complex configuration than the .coveragerc file can easily do.
See :ref:`api_plugin` for details.  This solves the complex configuration
problem described in `issue 563`_.

- The ``fail_under`` option can now be a float.  Note that you must specify the
``[report] precision`` configuration option for the fractional part to be
used.  Thanks to Lars Hupfeldt Nielsen for help with the implementation.
Fixes `issue 631`_.

- The ``include`` and ``omit`` options can be specified for both the ``[run]``
and ``[report]`` phases of execution.  4.4.2 introduced some incorrect
interactions between those phases, where the options for one were confused
for the other.  This is now corrected, fixing `issue 621`_ and `issue 622`_.
Thanks to Daniel Hahler for seeing more clearly than I could.

- The ``coverage combine`` command used to always overwrite the data file, even
when no data had been read from apparently combinable files.  Now, an error
is raised if we thought there were files to combine, but in fact none of them
could be used.  Fixes `issue 629`_.

- The ``coverage combine`` command could get confused about path separators
when combining data collected on Windows with data collected on Linux, as
described in `issue 618`_.  This is now fixed: the result path always uses
the path separator specified in the ``[paths]`` result.

- On Windows, the HTML report could fail when source trees are deeply nested,
due to attempting to create HTML filenames longer than the 250-character
maximum.  Now filenames will never get much larger than 200 characters,
fixing `issue 627`_.  Thanks to Alex Sandro for helping with the fix.

.. _issue 563: https://bitbucket.org/ned/coveragepy/issues/563/platform-specific-configuration
.. _issue 618: https://bitbucket.org/ned/coveragepy/issues/618/problem-when-combining-windows-generated
.. _issue 621: https://bitbucket.org/ned/coveragepy/issues/621/include-ignored-warning-when-using
.. _issue 622: https://bitbucket.org/ned/coveragepy/issues/622/report-omit-overwrites-run-omit
.. _issue 627: https://bitbucket.org/ned/coveragepy/issues/627/failure-generating-html-reports-when-the
.. _issue 629: https://bitbucket.org/ned/coveragepy/issues/629/multiple-use-of-combine-leads-to-empty
.. _issue 631: https://bitbucket.org/ned/coveragepy/issues/631/precise-coverage-percentage-value


.. _changes_442:

4.4.2

----------------------------

- Support for Python 3.7.  In some cases, class and module docstrings are no
longer counted in statement totals, which could slightly change your total
results.

- Specifying both ``--source`` and ``--include`` no longer silently ignores the
include setting, instead it displays a warning. Thanks, Loïc Dachary.  Closes
`issue 265`_ and `issue 101`_.

- Fixed a race condition when saving data and multiple threads are tracing
(`issue 581`_). It could produce a "dictionary changed size during iteration"
RuntimeError.  I believe this mostly but not entirely fixes the race
condition.  A true fix would likely be too expensive.  Thanks, Peter Baughman
for the debugging, and Olivier Grisel for the fix with tests.

- Configuration values which are file paths will now apply tilde-expansion,
closing `issue 589`_.

- Now secondary config files like tox.ini and setup.cfg can be specified
explicitly, and prefixed sections like `[coverage:run]` will be read. Fixes
`issue 588`_.

- Be more flexible about the command name displayed by help, fixing
`issue 600`_. Thanks, Ben Finney.

.. _issue 101: https://bitbucket.org/ned/coveragepy/issues/101/settings-under-report-affect-running
.. _issue 581: https://bitbucket.org/ned/coveragepy/issues/581/race-condition-when-saving-data-under
.. _issue 588: https://bitbucket.org/ned/coveragepy/issues/588/using-rcfile-path-to-toxini-uses-run
.. _issue 589: https://bitbucket.org/ned/coveragepy/issues/589/allow-expansion-in-coveragerc
.. _issue 600: https://bitbucket.org/ned/coveragepy/issues/600/get-program-name-from-command-line-when


.. _changes_441:

Links

• PyPI: https://pypi.org/project/coverage
• Changelog: https://pyup.io/changelogs/coverage/
• Repo: https://github.com/nedbat/coveragepy

[pyup-bot]

Closing this in favor of #199