mirror of https://github.com/python/cpython
Improve trace documentation (#9264). Patch by Eli Bendersky.
This commit is contained in:
Éric Araujo
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@ -17,71 +17,119 @@ or from the command line.
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.. _trace-cli:
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Command Line Usage
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Command-Line Usage
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------------------
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The :mod:`trace` module can be invoked from the command line. It can be as
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simple as ::
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python -m trace --count somefile.py ...
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python -m trace --count -C . somefile.py ...
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The above will generate annotated listings of all Python modules imported during
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the execution of :file:`somefile.py`.
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The above will execute :file:`somefile.py` and generate annotated listings of all
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Python modules imported during the execution into the current directory.
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The following command-line arguments are supported:
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.. program:: trace
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.. cmdoption:: --help
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Display usage and exit.
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.. cmdoption:: --version
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Display the version of the module and exit.
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Main options
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^^^^^^^^^^^^
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At least one of the following options must be specified when invoking :mod:`trace`.
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The :option:`--listfuncs <-l>` option is mutually exclusive with the
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:option:`--trace <-t>` and :option:`--counts <-c>` options . When :option:`--listfuncs <-l>`
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is provided, neither :option:`--counts <-c>` nor :option:`--trace <-t>` are accepted,
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and vice versa.
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.. program:: trace
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.. cmdoption:: -c, --count
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Produce a set of annotated listing files upon program completion that shows
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how many times each statement was executed.
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See also :option:`--coverdir <-C>`, :option:`--file <-f>`,
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:option:`--no-report <-R>` below.
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.. cmdoption:: -t, --trace
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:option:`--trace`, :option:`-t`
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Display lines as they are executed.
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:option:`--count`, :option:`-c`
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Produce a set of annotated listing files upon program completion that shows how
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many times each statement was executed.
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.. cmdoption:: -l, --listfuncs
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Display the functions executed by running the program.
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.. cmdoption:: -r, --report
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:option:`--report`, :option:`-r`
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Produce an annotated list from an earlier program run that used the
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:option:`--count` and :option:`--file` arguments.
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:option:`--count <-c>` and :option:`--file <-f>` option. Do not execute any code.
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:option:`--no-report`, :option:`-R`
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Do not generate annotated listings. This is useful if you intend to make
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several runs with :option:`--count` then produce a single set of annotated
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listings at the end.
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.. cmdoption:: -T, --trackcalls
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:option:`--listfuncs`, :option:`-l`
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List the functions executed by running the program.
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Display the calling relationships exposed by running the program.
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:option:`--trackcalls`, :option:`-T`
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Generate calling relationships exposed by running the program.
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Modifiers
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^^^^^^^^^
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:option:`--file`, :option:`-f`
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Name a file containing (or to contain) counts.
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.. program:: trace
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:option:`--coverdir`, :option:`-C`
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Name a directory in which to save annotated listing files.
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.. cmdoption:: -f, --file=<file>
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Name of a file to accumulate counts over several tracing runs. Should be used
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with the :option:`--count <-c>` option.
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.. cmdoption:: -C, --coverdir=<dir>
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Directory where the report files go. The coverage report for
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``package.module`` is written to file :file:`{dir}/{package}/{module}.cover`.
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.. cmdoption:: -m, --missing
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:option:`--missing`, :option:`-m`
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When generating annotated listings, mark lines which were not executed with
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'``>>>>>>``'.
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``>>>>>>``.
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:option:`--summary`, :option:`-s`
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When using :option:`--count` or :option:`--report`, write a brief summary to
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stdout for each file processed.
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.. cmdoption:: -s, --summary
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:option:`--ignore-module`
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Accepts comma separated list of module names. Ignore each of the named
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module and its submodules (if it is a package). May be given
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multiple times.
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When using :option:`--count <-c>` or :option:`--report <-r>`, write a brief
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summary to stdout for each file processed.
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:option:`--ignore-dir`
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Ignore all modules and packages in the named directory and subdirectories
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(multiple directories can be joined by os.pathsep). May be given multiple
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times.
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.. cmdoption:: -R, --no-report
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Do not generate annotated listings. This is useful if you intend to make
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several runs with :option:`--count <-c>`, and then produce a single set of
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annotated listings at the end.
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.. cmdoption:: -g, --timing
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Prefix each line with the time since the program started. Only used while
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tracing.
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Filters
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^^^^^^^
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These options may be repeated multiple times.
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.. program:: trace
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.. cmdoption:: --ignore-module=<mod>
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Ignore each of the given module names and its submodules (if it is a package).
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The argument can be a list of names separated by a comma.
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.. cmdoption:: --ignore-dir=<dir>
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Ignore all modules and packages in the named directory and subdirectories.
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The argument can be a list of directories separated by :data:`os.pathsep`.
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.. _trace-api:
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Programming Interface
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---------------------
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Programmatic Interface
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----------------------
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.. class:: Trace(count=1, trace=1, countfuncs=0, countcallers=0, ignoremods=(), ignoredirs=(), infile=None, outfile=None, timing=False)
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@ -91,29 +139,50 @@ Programming Interface
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called during the run. *countcallers* enables call relationship tracking.
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*ignoremods* is a list of modules or packages to ignore. *ignoredirs* is a list
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of directories whose modules or packages should be ignored. *infile* is the
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file from which to read stored count information. *outfile* is a file in which
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to write updated count information. *timing* enables a timestamp relative
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to when tracing was started to be displayed.
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name of the file from which to read stored count information. *outfile* is
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the name of the file in which to write updated count information. *timing*
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enables a timestamp relative to when tracing was started to be displayed.
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.. method:: Trace.run(cmd)
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Run *cmd* under control of the Trace object with the current tracing parameters.
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Execute the command and gather statistics from the execution with
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the current tracing parameters.
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*cmd* must be a string or code object, suitable for passing into :func:`exec`.
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.. method:: Trace.runctx(cmd, globals=None, locals=None)
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Run *cmd* under control of the Trace object with the current tracing parameters
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in the defined global and local environments. If not defined, *globals* and
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*locals* default to empty dictionaries.
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Execute the command and gather statistics from the execution with
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the current tracing parameters, in the defined global and local environments.
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If not defined, *globals* and *locals* default to empty dictionaries.
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.. method:: Trace.runfunc(func, *args, **kwds)
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Call *func* with the given arguments under control of the :class:`Trace` object
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with the current tracing parameters.
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This is a simple example showing the use of this module::
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.. method:: Trace.results()
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Return a :class:`CoverageResults` object that contains the cumulative results
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of all previous calls to ``run``, ``runctx`` and ``runfunc`` for the given
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:class:`Trace` instance. Does not reset the accumulated trace results.
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.. class:: CoverageResults
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A container for coverage results, created by :meth:`Trace.results`. Should not
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be created directly by the user.
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.. method:: CoverageResults.update(other)
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Merge in data from another :class:`CoverageResults` object.
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.. method:: CoverageResults.write_results(show_missing=True, summary=False, coverdir=None)
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Write coverage results. Set *show_missing* to show lines that had no hits.
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Set *summary* to include in the output the coverage summary per module. *coverdir*
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specifies the directory into which the coverage result files will be output.
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If ``None``, the results for each source file are placed in its directory.
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A simple example demonstrating the use of the programmatic interface::
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import sys
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import trace
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