class_docstr: A class to load, modify, and display the StreamAlertCLI Config
docstr: Set the Org Prefix in Global settings
docstr_tok: ["Set","the","Org","Prefix","in","Global","settings"]
code: def set_prefix(self, prefix):
      """Set the Org Prefix in Global settings"""
      if not isinstance(prefix, str):
          LOGGER.error("Invalid prefix type, must be string")
          return False
  
      acceptable_chars = set([*string.digits, *string.ascii_lowercase])
      if not set(prefix).issubset(acceptable_chars):
          LOGGER.error(
              "Prefix must contain only lowercase letters and numbers"
          )
          return False
  
      self.config["global"]["account"]["prefix"] = prefix
  
      self.write()
  
      LOGGER.info("Prefix successfully configured")
  
      return True
  
imports: import json
  import os
  import re
  import shutil
  import string
  import tempfile
  from streamalert.apps import StreamAlertApp
  from streamalert.shared import CLUSTERED_FUNCTIONS, config, metrics
  from streamalert.shared.logger import get_logger
  from streamalert_cli.terraform import TERRAFORM_FILES_PATH
  from streamalert_cli.apps.helpers import save_app_auth_info
  from streamalert_cli.helpers import continue_prompt
label_desc: Use image node_id 11 for calling the CLIConfig obj's underlying member method code with example usage: obj.set_prefix(prefix) and returns: True, False, False