docstr: Parse the attribute line if it knows how. Returns the parsed
  attribute, or None.
  
  For string attributes, the attribute string would be like
  'string'.
docstr_tok: ["Parse","the","attribute","line","if","it","knows","how",".","Returns","the","parsed","attribute",",","or","None",".","For","string","attributes",",","the","attribute","string","would","be","like","'string","'","."]
code: def parse_attribute(cls, name, attr_string):
      """
      Parse the attribute line if it knows how. Returns the parsed
      attribute, or None.
  
      For string attributes, the attribute string would be like
      'string'.
      """
  
      attr_string = attr_string.lower().strip()
  
      if attr_string[: len("string")] == "string":
          return cls(name)
      else:
          return None
  
imports: import re
  import datetime
  import numpy
  import csv
  import ctypes
label_desc: Use image node_id 2 for calling the StringAttribute obj's underlying member method code with example usage: obj.parse_attribute(cls, name, attr_string) and returns: cls, None