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copied!<p>I don't think you can do this in Python 2.x, but something similar to this functionality is part of Python 3. From <a href="http://www.python.org/dev/peps/pep-3134/" rel="noreferrer">PEP 3134</a>:</p> <blockquote> <p>In today's Python implementation, exceptions are composed of three parts: the type, the value, and the traceback. The 'sys' module, exposes the current exception in three parallel variables, exc_type, exc_value, and exc_traceback, the sys.exc_info() function returns a tuple of these three parts, and the 'raise' statement has a three-argument form accepting these three parts. Manipulating exceptions often requires passing these three things in parallel, which can be tedious and error-prone. Additionally, the 'except' statement can only provide access to the value, not the traceback. Adding the '<strong>traceback</strong>' attribute to exception values makes all the exception information accessible from a single place.</p> </blockquote> <p>Comparison to C#:</p> <blockquote> <p>Exceptions in C# contain a read-only 'InnerException' property that may point to another exception. Its documentation [10] says that "When an exception X is thrown as a direct result of a previous exception Y, the InnerException property of X should contain a reference to Y." This property is not set by the VM automatically; rather, all exception constructors take an optional 'innerException' argument to set it explicitly. The '<strong>cause</strong>' attribute fulfills the same purpose as InnerException, but this PEP proposes a new form of 'raise' rather than extending the constructors of all exceptions. C# also provides a GetBaseException method that jumps directly to the end of the InnerException chain; this PEP proposes no analog.</p> </blockquote> <p>Note also that Java, Ruby and Perl 5 don't support this type of thing either. Quoting again:</p> <blockquote> <p>As for other languages, Java and Ruby both discard the original exception when another exception occurs in a 'catch'/'rescue' or 'finally'/'ensure' clause. Perl 5 lacks built-in structured exception handling. For Perl 6, RFC number 88 [9] proposes an exception mechanism that implicitly retains chained exceptions in an array named @@.</p> </blockquote>

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