Index: Doc/library/trace.rst =================================================================== --- Doc/library/trace.rst (revision 83064) +++ Doc/library/trace.rst (working copy) @@ -1,4 +1,3 @@ - :mod:`trace` --- Trace or track Python statement execution ========================================================== @@ -20,67 +19,108 @@ The :mod:`trace` module can be invoked from the command line. It can be as simple as :: - python -m trace --count somefile.py ... + python -m trace --count -C . somefile.py ... -The above will generate annotated listings of all Python modules imported during -the execution of :file:`somefile.py`. +The above will execute :file:`somefile.py` and generate annotated listings of all +Python modules imported during the execution into the current directory. -The following command-line arguments are supported: +Meta-options +^^^^^^^^^^^^ -:option:`--trace`, :option:`-t` +``--help`` + + Display usage and exit. + +``--version`` + + Display the version of the module and exit. + +Main options +^^^^^^^^^^^^ + +The ``--listfuncs`` option is mutually exclusive with the ``--trace`` and +``--count`` options . When ``--listfuncs`` is provided, neither ``--counts`` +nor ``--trace`` are accepted, and vice versa. + +``--count, -c`` + + Produce a set of annotated listing files upon program completion that shows + how many times each statement was executed. + See also ``--coverdir``, ``--file``, ``--no-report`` below. + +``--trace, -t`` + Display lines as they are executed. -:option:`--count`, :option:`-c` - Produce a set of annotated listing files upon program completion that shows how - many times each statement was executed. +``--listfuncs, -l`` -:option:`--report`, :option:`-r` - Produce an annotated list from an earlier program run that used the - :option:`--count` and :option:`--file` arguments. + Display the functions executed by running the program. -:option:`--no-report`, :option:`-R` - Do not generate annotated listings. This is useful if you intend to make - several runs with :option:`--count` then produce a single set of annotated - listings at the end. +``--report, -r`` -:option:`--listfuncs`, :option:`-l` - List the functions executed by running the program. + Produce an annotated list from an earlier program run that used the ``--count`` + and ``--file`` option. Do not execute any code. -:option:`--trackcalls`, :option:`-T` - Generate calling relationships exposed by running the program. +``--trackcalls, -T`` -:option:`--file`, :option:`-f` - Name a file containing (or to contain) counts. + Display the calling relationships exposed by running the program. -:option:`--coverdir`, :option:`-C` - Name a directory in which to save annotated listing files. +Modifiers +^^^^^^^^^ -:option:`--missing`, :option:`-m` +``--file=, -f`` + + Name of a file to accumulate counts over several tracing runs. Should be used + with the ``--count`` option. + +``--coverdir=, -C`` + + Directory where the report files go. The coverage report for + ``package.module`` is written to file ``dir/package/module.cover``. + +``--missing, -m`` + When generating annotated listings, mark lines which were not executed with '``>>>>>>``'. -:option:`--summary`, :option:`-s` - When using :option:`--count` or :option:`--report`, write a brief summary to +``--summary, -s`` + + When using ``--count`` or ``--report``, write a brief summary to stdout for each file processed. -:option:`--ignore-module` +``--no-report, -R`` + + Do not generate annotated listings. This is useful if you intend to make + several runs with ``--count`` then produce a single set of annotated + listings at the end. + +``--timing, -g`` + + Prefix each line with the time since the program started. Only used while + tracing. + +Filters +^^^^^^^ + +These options may be repeated multiple times. + +``--ignore-module=`` + Accepts comma separated list of module names. Ignore each of the named - module and its submodules (if it is a package). May be given - multiple times. + modules and its submodules (if it is a package). -:option:`--ignore-dir` +``--ignore-dir=`` + Ignore all modules and packages in the named directory and subdirectories - (multiple directories can be joined by os.pathsep). May be given multiple - times. + (multiple directories can be joined by ``os.pathsep``). - .. _trace-api: Programming Interface --------------------- -.. class:: Trace([count=1[, trace=1[, countfuncs=0[, countcallers=0[, ignoremods=()[, ignoredirs=()[, infile=None[, outfile=None[, timing=False]]]]]]]]]) +.. class:: Trace(count=1, trace=1, countfuncs=0, countcallers=0, ignoremods=(), ignoredirs=(), infile=None, outfile=None, timing=False) Create an object to trace execution of a single statement or expression. All parameters are optional. *count* enables counting of line numbers. *trace* @@ -88,19 +128,20 @@ called during the run. *countcallers* enables call relationship tracking. *ignoremods* is a list of modules or packages to ignore. *ignoredirs* is a list of directories whose modules or packages should be ignored. *infile* is the - file from which to read stored count information. *outfile* is a file in which - to write updated count information. *timing* enables a timestamp relative - to when tracing was started to be displayed. + name of the file from which to read stored count information. *outfile* is + the name of the file in which to write updated count information. *timing* + enables a timestamp relative to when tracing was started to be displayed. .. method:: Trace.run(cmd) - Run *cmd* under control of the Trace object with the current tracing parameters. + Run *cmd* under control of the :class:`Trace` object with the current tracing parameters. + *cmd* must be a string or code object, suitable for passing into :func:`exec`. -.. method:: Trace.runctx(cmd[, globals=None[, locals=None]]) +.. method:: Trace.runctx(cmd, globals=None, locals=None) - Run *cmd* under control of the Trace object with the current tracing parameters + Run *cmd* under control of the :class:`Trace` object with the current tracing parameters in the defined global and local environments. If not defined, *globals* and *locals* default to empty dictionaries. @@ -110,8 +151,32 @@ Call *func* with the given arguments under control of the :class:`Trace` object with the current tracing parameters. -This is a simple example showing the use of this module:: +.. method:: Trace.results() + Return a :class:`CoverageResults` object that contains the cumulative results + of all previous calls to ``run``, ``runctx`` and ``runfunc`` for the given + :class:`Trace` instance. Does not reset the accumulated trace results. + +.. class:: CoverageResults + + A container for coverage results, created by :meth:`Trace.results`. Should not + be created directly by the user. + +.. method:: CoverageResults.update(other) + + Merge in data from another :class:`CoverageResults` object. + +.. method:: CoverageResults.write_results(show_missing=True, summary=False, coverdir=None) + + Write coverage results. Set *show_missing* to show lines that had no hits. + Set *summary* to include in the output the coverage summary per module. *coverdir* + specifies the directory into which the coverage result files will be output. + If ``None``, the results for each source file are placed in its directory. + +.. + +A simple example demonstrating the use of the programming interface:: + import sys import trace