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| 1 .. _faq: |
| 2 |
| 3 ================== |
| 4 FAQ and other help |
| 5 ================== |
| 6 |
| 7 :history: 20090613T141800, brand new docs. |
| 8 :history: 20091005T073900, updated for 3.1. |
| 9 :history: 20091127T201500, updated for 3.2. |
| 10 :history: 20110605T175500, add the announcement mailing list. |
| 11 :history: 20121231T104700, Tweak the py3 text. |
| 12 |
| 13 |
| 14 Frequently asked questions |
| 15 -------------------------- |
| 16 |
| 17 **Q: I use nose to run my tests, and its cover plugin doesn't let me create |
| 18 HTML or XML reports. What should I do?** |
| 19 |
| 20 First run your tests and collect coverage data with `nose`_ and its plugin. |
| 21 This will write coverage data into a .coverage file. Then run coverage.py from |
| 22 the :ref:`command line <cmd>` to create the reports you need from that data. |
| 23 |
| 24 .. _nose: http://somethingaboutorange.com/mrl/projects/nose |
| 25 |
| 26 |
| 27 **Q: Why do unexecutable lines show up as executed?** |
| 28 |
| 29 Usually this is because you've updated your code and run coverage on it |
| 30 again without erasing the old data. Coverage records line numbers executed, so |
| 31 the old data may have recorded a line number which has since moved, causing |
| 32 coverage to claim a line has been executed which cannot be. |
| 33 |
| 34 If you are using the ``-x`` command line action, it doesn't erase first by |
| 35 default. Switch to the ``coverage run`` command, or use the ``-e`` switch to |
| 36 erase all data before starting the next run. |
| 37 |
| 38 |
| 39 **Q: Why do the bodies of functions (or classes) show as executed, but the def |
| 40 lines do not?** |
| 41 |
| 42 This happens because coverage is started after the functions are defined. The |
| 43 definition lines are executed without coverage measurement, then coverage is |
| 44 started, then the function is called. This means the body is measured, but |
| 45 the definition of the function itself is not. |
| 46 |
| 47 To fix this, start coverage earlier. If you use the :ref:`command line <cmd>` |
| 48 to run your program with coverage, then your entire program will be monitored. |
| 49 If you are using the :ref:`API <api>`, you need to call coverage.start() before |
| 50 importing the modules that define your functions. |
| 51 |
| 52 |
| 53 **Q: Does coverage.py work on Python 3.x?** |
| 54 |
| 55 Yes, Python 3 is fully supported. |
| 56 |
| 57 |
| 58 **Q: Isn't coverage testing the best thing ever?** |
| 59 |
| 60 It's good, but `it isn't perfect`__. |
| 61 |
| 62 __ http://nedbatchelder.com/blog/200710/flaws_in_coverage_measurement.html |
| 63 |
| 64 |
| 65 .. Other resources |
| 66 --------------- |
| 67 |
| 68 There are a number of projects that help integrate coverage.py into other |
| 69 systems: |
| 70 |
| 71 - `trialcoverage`_ is a plug-in for Twisted trial. |
| 72 |
| 73 .. _trialcoverage: http://pypi.python.org/pypi/trialcoverage |
| 74 |
| 75 - `pytest-coverage`_ |
| 76 |
| 77 .. _pytest-coverage: http://pypi.python.org/pypi/pytest-coverage |
| 78 |
| 79 - `django-coverage`_ for use with Django. |
| 80 |
| 81 .. _django-coverage: http://pypi.python.org/pypi/django-coverage |
| 82 |
| 83 |
| 84 **Q: Where can I get more help with coverage.py?** |
| 85 |
| 86 You can discuss coverage.py or get help using it on the `Testing In Python`_ |
| 87 mailing list. |
| 88 |
| 89 .. _Testing In Python: http://lists.idyll.org/listinfo/testing-in-python |
| 90 |
| 91 Bug reports are gladly accepted at the `Bitbucket issue tracker`_. |
| 92 |
| 93 .. _Bitbucket issue tracker: http://bitbucket.org/ned/coveragepy/issues |
| 94 |
| 95 Announcements of new coverage.py releases are sent to the |
| 96 `coveragepy-announce`_ mailing list. |
| 97 |
| 98 .. _coveragepy-announce: http://groups.google.com/group/coveragepy-announce |
| 99 |
| 100 `I can be reached`__ in a number of ways, I'm happy to answer questions about |
| 101 using coverage.py. I'm also available hourly for consultation or custom |
| 102 development. |
| 103 |
| 104 __ http://nedbatchelder.com/site/aboutned.html |
| 105 |
| 106 |
| 107 History |
| 108 ------- |
| 109 |
| 110 Coverage.py was originally written by `Gareth Rees`_. |
| 111 Since 2004, `Ned Batchelder`_ has extended and maintained it with the help of |
| 112 `many others`_. The :ref:`change history <changes>` has all the details. |
| 113 |
| 114 .. _Gareth Rees: http://garethrees.org/ |
| 115 .. _Ned Batchelder: http://nedbatchelder.com |
| 116 .. _many others: http://bitbucket.org/ned/coveragepy/src/tip/AUTHORS.txt |
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