optcomplete is a Python module that provides programmable shell completion support for Python scripts that use the optparse module. It implements the Bash completion protocol, and a simple common shell function invokes the script to provide the completion suggestions. As an optparse parser already contains most of the useful information to provide completions, only two lines of code are required to provide basic support for completions to an existing script. It also allows the developer to provide per-option completion, etc.
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