demo_python_numpy_datatype_error.py:
​x
 
import numpy as np
​
arr = np.array(['a', '2', '3'], dtype='i')
​
C:\Users\My Name>python demo_python_numpy_datatype_error.py
Traceback (most recent call last):
  File "demo_python_numpy_datatype_error.py", line 3, in 
ValueError: invalid literal for int() with base 10: 'a'