docstr: Find first occurrence of a string in a list of strings.
docstr_tok: ["Find","first","occurrence","of","a","string","in","a","list","of","strings","."]
code: def _findFirst(self, lines, string):
      """Find first occurrence of a string in a list of strings."""
      for i, line in enumerate(lines):
          find_index = line.find(string)
          if find_index >= 0:
              return i, find_index
  
imports: import re
  import numpy
  from tensorflow.core.framework import tensor_pb2
  from tensorflow.core.framework import tensor_shape_pb2
  from tensorflow.core.framework import types_pb2
  from tensorflow.python.debug.cli import cli_test_utils
  from tensorflow.python.debug.cli import tensor_format
  from tensorflow.python.debug.lib import debug_data
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 5 for calling the RichTextLinesTest obj's underlying member method code with example usage: obj._findFirst(lines, string) and returns: i,  find_index