code: def write_lines(self, linenos, tree=None):
      for lineno in linenos:
          self.write_line(lineno, tree=tree)
  
file_path: catboost/contrib/tools/cython/Cython/Tests/TestStringIOTree.py
imports: import unittest
  from Cython import StringIOTree
label_desc: Use image node_id 4 for calling the TestStringIOTree obj's underlying member method code with example usage: obj.write_lines(linenos, tree) without return types