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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 proto_refactor_files(dest_dir, namespace, namespace_path):
 """This method runs the refactoring on all the Protobuf files in the Dropsonde repo. Args: dest_dir (str):
 directory where the Protobuf files lives. namespace (str):
 the desired package name (i.e. "dropsonde.py2") namespace_path (str):
 the desired path corresponding to the package name (i.e. "dropsonde/py2") """

    for dn, dns, fns in os.walk(dest_dir):
        for fn in fns:
            fn = os.path.join(dn, fn)
            if fnmatch.fnmatch(fn, '*.proto'):
                data = proto_refactor(fn, namespace, namespace_path)
                with open(fn, 'w') as f:
                    f.write(data)