TypeError: unsupported operand type(s) for -: 'numpy.str_' and 'float'

This error occurs when you try to perform a mathematical operation between a numpy string and a float. Numpy strings cannot be used in mathematical operations as they are not numeric types.

To resolve this error, you need to convert the numpy string to a numeric type such as a float or an integer before performing the mathematical operation. You can do this using the astype() method provided by numpy.

For example, if you have a numpy string '10' and a float value 5.0, you can convert the string to a float as follows:

import numpy as np

# create a numpy string
a = np.str_('10')

# convert the numpy string to a float
b = float(a)

# perform the mathematical operation
c = b - 5.0

print(c)

Output:

5.0

In this example, we convert the numpy string '10' to a float using the float() method and then perform the subtraction operation between the float value and the other float value.