6.8.1.2 Exceptions
Exceptions raised in the child process, before the new program has started to execute, will be re-raised in the parent. Additionally, the exception object will have one extra attribute called child_traceback, which is a string containing traceback information from the childs point of view.
The most common exception raised is OSError. This occurs, for example, when trying to execute a non-existent file. Applications should prepare for OSError exceptions.
A ValueError will be raised if Popen is called with invalid arguments.
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Release 2.4.4c1, documentation updated on 11 October 2006.