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66 lines
2.8 KiB
66 lines
2.8 KiB
4 months ago
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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 this to the top of your CGI script::
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import cgitb
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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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