Georg Brandl <ge...@python.org> added the comment:

After forking, the parent waits for the child's exec call to determine if it 
succeeds.  Otherwise, you wouldn't get an exception in the parent when you do

Popen('/bin/ech')

or somesuch.

----------
nosy: +georg.brandl
resolution:  -> invalid
status: open -> pending

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10635>
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