require(name, version=None)
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
A decorator that raises an ImportError if a function is run in the absence of the input dependency.
Return decorator that forces a requirement for a function or class.
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