docstr: Parse the attribute line if it knows how. Returns the parsed
  attribute, or None.
  
  For numeric attributes, the attribute string would be like
  'numeric' or 'int' or 'real'.
docstr_tok: ["Parse","the","attribute","line","if","it","knows","how",".","Returns","the","parsed","attribute",",","or","None",".","For","numeric","attributes",",","the","attribute","string","would","be","like","'numeric","'","or","'int","'","or","'real","'","."]
code: def parse_attribute(cls, name, attr_string):
      """
      Parse the attribute line if it knows how. Returns the parsed
      attribute, or None.
  
      For numeric attributes, the attribute string would be like
      'numeric' or 'int' or 'real'.
      """
  
      attr_string = attr_string.lower().strip()
  
      if (
          attr_string[: len("numeric")] == "numeric"
          or attr_string[: len("int")] == "int"
          or attr_string[: len("real")] == "real"
      ):
          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 NumericAttribute obj's underlying member method code with example usage: obj.parse_attribute(cls, name, attr_string) and returns: cls, None