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New in version 2.4.
The subprocess module allows you to spawn new processes, connect to their input/output/error pipes, and obtain their return codes. This module intends to replace several other, older modules and functions, such as:
os.system os.spawn* os.popen* popen2.* commands.*
Information about how the subprocess module can be used to replace these modules and functions can be found in the following sections.
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