docs: def parse_quantity(q):
      """
      Parse an OnShape units definition
      Args:
          q:
  
      Returns:
          a string that can be converted to any other unit engine.
  
      >>> from onshapepy.core.utils import parse_quantity
      >>> d = {'value': 0.1414213562373095, 'unitToPower': [{'value': 1, 'key': 'METER'}], 'typeTag': ''}
      >>> parse_quantity(d)
      '0.1414213562373095*meter'
  
      >>> d = {'value': 0.1414213562373095, 'unitToPower': [{'value': 3, 'key': 'MILLIMETER'}], 'typeTag': ''}
      >>> parse_quantity(d)
      '0.1414213562373095*millimeter**3'
      """
      units_s = str(q['value'])
      for u in q['unitToPower']:
          units_s = units_s + "*" + u['key'].lower()
          power = u['value']
          if not power == 1:
              units_s = units_s + "**" + str(power)
      return units_s