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NumPy: Test digits only, lower case and upper case letters only

NumPy String: Exercise-17 with Solution

Write a NumPy program to check whether each element of a given array is composed of digits only, lower case letters only and upper case letters only.

Sample Solution:-

Python Code:

import numpy as np
x = np.array(['Python', 'PHP', 'JS', 'Examples', 'html5', '5'], dtype=np.str)
print("\nOriginal Array:")
print(x)
r1 = np.char.isdigit(x)
r2 = np.char.islower(x)
r3 = np.char.isupper(x)
print("Digits only =", r1)
print("Lower cases only =", r2)
print("Upper cases only =", r3)

Sample Input:

(['Python', 'PHP', 'JS', 'Examples', 'html5', '5'], dtype=np.str)

Sample Output:

Original Array:
['Python' 'PHP' 'JS' 'Examples' 'html5' '5']
Digits only = [False False False False False  True]
Lower cases only = [False False False False  True False]
Upper cases only = [False  True  True False False False]

Pictorial Presentation:

NumPy String: Test digits only, lower case and upper case letters only
NumPy String: Test digits only, lower case and upper case letters only
NumPy String: Test digits only, lower case and upper case letters only

Python-Numpy Code Editor:

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Python: Tips of the Day

Debug With the Print() Function:

>>> for i in range(5):
...     print(i, end=', ' if i < 4 else '\n')
... 
0, 1, 2, 3, 4
>>> for i in range(5):
...     print(f'{i} & {i*i}', end=', ' if i < 4 else '\n')
... 
0 & 0, 1 & 1, 2 & 4, 3 & 9, 4 & 16