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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 load(self, path):
 """ Load a manifest at path or return a suitable manifest already loaded. """

        path = os.path.normpath(path)
        mtime = os.stat(path).st_mtime

        if path not in self or self[path].mtime != mtime:
            manifest = self.build(path)
            self[path] = self.manifest_mod(manifest, mtime)

        return self[path].manifest