1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
:mod:`trace` --- Trace or track Python statement execution
==========================================================
.. module:: trace
:synopsis: Trace or track Python statement execution.
The :mod:`trace` module allows you to trace program execution, generate
annotated statement coverage listings, print caller/callee relationships and
list functions executed during a program run. It can be used in another program
or from the command line.
.. _trace-cli:
Command Line Usage
------------------
The :mod:`trace` module can be invoked from the command line. It can be as
simple as ::
python -m trace --count somefile.py ...
The above will generate annotated listings of all Python modules imported during
the execution of :file:`somefile.py`.
The following command-line arguments are supported:
:option:`--trace`, :option:`-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.
:option:`--report`, :option:`-r`
Produce an annotated list from an earlier program run that used the
:option:`--count` and :option:`--file` arguments.
: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.
:option:`--listfuncs`, :option:`-l`
List the functions executed by running the program.
:option:`--trackcalls`, :option:`-T`
Generate calling relationships exposed by running the program.
:option:`--file`, :option:`-f`
Name a file containing (or to contain) counts.
:option:`--coverdir`, :option:`-C`
Name a directory in which to save annotated listing files.
:option:`--missing`, :option:`-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
stdout for each file processed.
:option:`--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.
:option:`--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.
.. _trace-api:
Programming Interface
---------------------
.. class:: Trace([count=1[, trace=1[, countfuncs=0[, countcallers=0[, ignoremods=()[, ignoredirs=()[, infile=None[, outfile=None]]]]]]]])
Create an object to trace execution of a single statement or expression. All
parameters are optional. *count* enables counting of line numbers. *trace*
enables line execution tracing. *countfuncs* enables listing of the functions
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.
.. method:: Trace.run(cmd)
Run *cmd* under control of the Trace object with the current tracing parameters.
.. method:: Trace.runctx(cmd[, globals=None[, locals=None]])
Run *cmd* under control of the Trace object with the current tracing parameters
in the defined global and local environments. If not defined, *globals* and
*locals* default to empty dictionaries.
.. method:: Trace.runfunc(func, *args, **kwds)
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::
import sys
import trace
# create a Trace object, telling it what to ignore, and whether to
# do tracing or line-counting or both.
tracer = trace.Trace(
ignoredirs=[sys.prefix, sys.exec_prefix],
trace=0,
count=1)
# run the new command using the given tracer
tracer.run('main()')
# make a report, placing output in /tmp
r = tracer.results()
r.write_results(show_missing=True, coverdir="/tmp")
|
