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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def patch_module(name, pname, pfile=None, attrib=None):
 """Create a patched copy of the named module and register it in ``sys.modules``. Parameters name : string Name of source module pname : string Name of patched copy of module pfile : string or None, optional (default None) Value to assign as source file name of patched module attrib : dict or None, optional (default None) Dict of attribute names and values to assign to patched module Returns ------- mod : module Patched module """


    if attrib is None:
        attrib = {}
    spec = importlib.util.find_spec(name)
    spec.name = pname
    if pfile is not None:
        spec.origin = pfile
    spec.loader.name = pname
    mod = importlib.util.module_from_spec(spec)
    mod.__spec__ = spec
    mod.__loader__ = spec.loader
    sys.modules[pname] = mod
    spec.loader.exec_module(mod)
    for k, v in attrib.items():
        setattr(mod, k, v)
    return mod