The isupper() function of numpy.strings module

# Example Python program that finds whether 
# the string elements of an ndarray consists of 
# all uppercase elements using the function
# numpy.strings.isupper()
import numpy

# Create a NumPy array of ASCII strings
asciiStrings = numpy.ndarray(shape = (2, 2), 
                         dtype = numpy.dtype('S10'))
asciiStrings[0][0] = "abCD"
asciiStrings[0][1] = "xYz"
asciiStrings[1][0] = "ALL"
asciiStrings[1][1] = "none"

# Find whether the strings contain all uppercase letters
res = numpy.strings.isupper(asciiStrings)
print("ASCII strings:")
print(asciiStrings)
print("Are they comprised of all uppercase letters:")
print(res)

ASCII strings:

[[b'abCD' b'xYz']

 [b'ALL' b'none']]

Are they comprised of all uppercase letters:

[[False False]

 [ True False]]