is_installed(name, version=None)
Original Copyright (C) 2009-2011 Pierre Raybaut Licensed under the terms of the MIT License.
Name of module or "python"
Version string to test against. If version is not None, checking version (must have an attribute named '__version__' or 'VERSION') Version may start with =, >=, > or < to specify the exact requirement
True if :None:None:`name` is installed matching the optional version.
Test if name is installed.
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