code: def is_quantity(q):
      '''
      is_quantity(q) yields True if q is a pint quantity or a tuple (scalar, unit) and False
        otherwise.
      '''
      if isinstance(q, tuple):
          return len(q) == 2 and is_unit(q[1])
      else:
          cls = type(q)
          return cls.__module__.startswith('pint.') and cls.__name__ == 'Quantityf is_quantity(q):
      '''
      is_quantity(q) yields True if q is a pint quantity or a tuple (scalar, unit) and False
        otherwise.
      '''
      if isinstance(q, tuple):
          return len(q) == 2 and is_unit(q[1])
      else:
          cls = type(q)
          return cls.__module__.startswith('pint.') and cls.__name__ == 'Quantity'
docs: is_quantity(q) yields True if q is a pint quantity or a tuple (scalar, unit) and False
        otherwise.