code: def base_branch(self) -> str:
      return f"branch-{self.release_level}"
  
file_path: bokeh/release/config.py
imports: from __future__ import annotations
  import re
  from .enums import VersionType
  from .logger import LOG, Scrubber
label_desc: Use image node_id 13 for calling the Config obj's underlying member method code with example usage: obj.base_branch() and returns: str, self