6.8.1 Popen3 and Popen4 Objects
Instances of the Popen3 and Popen4 classes have the
following methods:
- poll ()
-
Returns
-1 if child process hasn't completed yet, or its return
code otherwise.
- wait ()
-
Waits for and returns the return code of the child process.
The following attributes are also available:
- fromchild
-
A file object that provides output from the child process. For
Popen4 instances, this will provide both the standard output
and standard error streams.
- tochild
-
A file object that provides input to the child process.
- childerr
-
Where the standard error from the child process goes is
capturestderr was true for the constructor, or
None.
This will always be None for Popen4 instances.
- pid
-
The process ID of the child process.
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