author | martin.trojer@nokia.com |
Fri, 31 Jul 2009 15:01:17 +0100 | |
changeset 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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:mod:`cgitb` --- Traceback manager for CGI scripts |
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================================================== |
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.. module:: cgitb |
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:synopsis: Configurable traceback handler for CGI scripts. |
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.. moduleauthor:: Ka-Ping Yee <ping@lfw.org> |
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.. sectionauthor:: Fred L. Drake, Jr. <fdrake@acm.org> |
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.. versionadded:: 2.2 |
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.. index:: |
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single: CGI; exceptions |
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single: CGI; tracebacks |
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single: exceptions; in CGI scripts |
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single: tracebacks; in CGI scripts |
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The :mod:`cgitb` module provides a special exception handler for Python scripts. |
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(Its name is a bit misleading. It was originally designed to display extensive |
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traceback information in HTML for CGI scripts. It was later generalized to also |
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display this information in plain text.) After this module is activated, if an |
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uncaught exception occurs, a detailed, formatted report will be displayed. The |
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report includes a traceback showing excerpts of the source code for each level, |
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as well as the values of the arguments and local variables to currently running |
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functions, to help you debug the problem. Optionally, you can save this |
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information to a file instead of sending it to the browser. |
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To enable this feature, simply add one line to the top of your CGI script:: |
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import cgitb; cgitb.enable() |
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The options to the :func:`enable` function control whether the report is |
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displayed in the browser and whether the report is logged to a file for later |
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analysis. |
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.. function:: enable([display[, logdir[, context[, format]]]]) |
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.. index:: single: excepthook() (in module sys) |
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This function causes the :mod:`cgitb` module to take over the interpreter's |
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default handling for exceptions by setting the value of :attr:`sys.excepthook`. |
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The optional argument *display* defaults to ``1`` and can be set to ``0`` to |
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suppress sending the traceback to the browser. If the argument *logdir* is |
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present, the traceback reports are written to files. The value of *logdir* |
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should be a directory where these files will be placed. The optional argument |
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*context* is the number of lines of context to display around the current line |
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of source code in the traceback; this defaults to ``5``. If the optional |
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argument *format* is ``"html"``, the output is formatted as HTML. Any other |
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value forces plain text output. The default value is ``"html"``. |
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.. function:: handler([info]) |
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This function handles an exception using the default settings (that is, show a |
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report in the browser, but don't log to a file). This can be used when you've |
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caught an exception and want to report it using :mod:`cgitb`. The optional |
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*info* argument should be a 3-tuple containing an exception type, exception |
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value, and traceback object, exactly like the tuple returned by |
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:func:`sys.exc_info`. If the *info* argument is not supplied, the current |
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exception is obtained from :func:`sys.exc_info`. |
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