code: def __div__(self, x):
      return PhysicalQuantity(float(self) / float(x))
  
imports: import pytest
  from numpy import logspace, linspace, geomspace, dtype, array, sctypes, arange, isnan, ndarray, sqrt, nextafter, stack, errstate
  from numpy.testing import assert_, assert_equal, assert_raises, assert_array_equal, assert_allclose
label_desc: Use image node_id 6 for calling the PhysicalQuantity obj's underlying member method code with example usage: obj.__div__(x) and returns: PhysicalQuantity