code: def get_linenumbers(functions, module, searchstr='def {}(image):\n'):
      
      lines = inspect.getsourcelines(module)[0]
      line_numbers = {}
      for function in functions:
          try:
              line_numbers[function] = lines.index(
                      searchstr.format(function)) + 1
          except ValueError:
              print(r'Can not find `{}`'.format(searchstr.format(function)))
              line_numbers[function] = 0
      return line_numbers
docs: Returns a dictionary which maps function names to line numbers.
  
      Args:
          functions: a list of function names
          module:    the module to look the functions up
          searchstr: the string to search for
      Returns:
          A dictionary with functions as keys and their line numbers as values.