code: def _verify_prefix(self, prefix):
      if prefix in self.file_systems:
          raise Exception("Could not add a duplicated file system")
  
file_path: blazingsql/pyblazing/pyblazing/apiv2/filesystem.py
imports: from collections import OrderedDict
  import cio
  from pyblazing.apiv2 import S3EncryptionType
label_desc: Use image node_id 8 for calling the FileSystem obj's underlying member method code with example usage: obj._verify_prefix(prefix) without return types