code: def _pretty_print(self, lines):
      def _lines():
          for indent, line in lines:
              yield "".join((" " * (indent * INDENT), line))
  
      return "\n".join(_lines())
  
file_path: metaflow/test/core/metaflow_test/formatter.py
imports: import sys
  import inspect
label_desc: Use image node_id 8 for calling the FlowFormatter obj's underlying member method code with example usage: obj._pretty_print(lines) and returns: str