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Python Library Reference

Previous: 11.2.10 Common problems and Up: 11. Internet Protocols and Next: 11.4 urllib

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11.3 cgitb -- Traceback manager for CGI scripts

New in version 2.2.  

The cgitb module provides a special exception handler for CGI scripts. After this module is activated, if an uncaught exception occurs, a detailed, formatted report will be sent to the Web browser. The report includes a traceback showing excerpts of the source code for each level, as well as the values of the arguments and local variables to currently running functions, to help you debug the problem. Optionally, you can save this information to a file instead of sending it to the browser.

To enable this feature, simply add one line to the top of your CGI script:

import cgitb; cgitb.enable()

The options to the enable() function control whether the report is displayed in the browser and whether the report is logged to a file for later analysis.

enable([display[, logdir[, context]]])

This function causes the cgitb module to take over the interpreter's default handling for exceptions by setting the value of sys.excepthook.  

The optional argument display defaults to 1 and can be set to 0 to suppress sending the traceback to the browser. If the argument logdir is present, the traceback reports are written to files. The value of logdir should be a directory where these files will be placed. The optional argument context is the number of lines of context to display around the current line of source code in the traceback; this defaults to 5.

handler([info])

This function handles an exception using the default settings (that is, show a report in the browser, but don't log to a file). This can be used when you've caught an exception and want to report it using cgitb. The optional info argument should be a 3-tuple containing an exception type, exception value, and traceback object, exactly like the tuple returned by sys.exc_info(). If the info argument is not supplied, the current exception is obtained from sys.exc_info().

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Python Library Reference

Previous: 11.2.10 Common problems and Up: 11. Internet Protocols and Next: 11.4 urllib

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Release 2.2.3, documentation updated on 30 May 2003.