Description

Versatile utility function to run external processes from Python, with many features:

* runs an external process and waits for it to finish

* does not deadlock, no matter the process stdout/stderr output

behaviour

* returns the exit code, stdout, stderr (separately, both as

bytestrings), and the total process runtime as a dictionary

* process can run in a custom environment, either as a modification

of the current environment or in a new environment from scratch

* stdin can be fed to the process, the returned dictionary contains

information how much was read by the process

* stdout and stderr is printed by default, can be disabled

* stdout and stderr can be passed to any arbitrary function for live

processing (separately, both as unicode strings)

* optionally enforces a time limit on the process

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