>>> import numpy as np
>>> err = np.seterr(all='raise')

>>> np.float32(1e-38) / np.float32(1e30)
0.0
>>> np.float32(1e-38) / np.array(1e38,np.float32)
0.0
>>> np.array(1e-38,np.float32) / np.float32(1e30)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
FloatingPointError: underflow encountered in divide

>>> np.float64(1e-300) / np.float64(1e300)
0.0
>>> np.float64(1e-300) / np.array(1e300, dtype=np.float64)
0.0
>>> np.array(1e-300, dtype=np.float64) / np.float64(1e300)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
FloatingPointError: underflow encountered in divide

>>> np.float32(1) / np.float32(0)
inf
>>> np.array(1,dtype=np.float32) / np.float32(0)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
FloatingPointError: divide by zero encountered in divide

>>> np.inf-np.inf
nan
>>> np.array(np.inf)-np.inf
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
FloatingPointError: invalid value encountered in subtract