python
Python 3.8.3 (default, May 17 2020, 18:15:42) 

>>> from mpmath import *
>>> f = lambda x, y: sin(x+y)*cos(y)
>>> splot(f, [-pi,pi], [-pi,pi]) 

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/python/Pyvenv/lib/python3.8/site-packages/mpmath/visualization.py", line 267, in splot
    u = pylab.linspace(ua, ub, M)
  File "<__array_function__ internals>", line 5, in linspace
  File "/home/python/Pyvenv/lib/python3.8/site-packages/numpy/core/function_base.py", line 132, in linspace
    dt = result_type(start, stop, float(num))
  File "<__array_function__ internals>", line 5, in result_type
TypeError: data type not understood
>>> 
>>> 
>>> matplotlib.__version__
'3.2.1'
>>> mpmath.__version__
'1.1.0'