NumPy: Capitalize the first letter, lowercase, uppercase, swapcase, title-case of all the elements of a given array
NumPy String: Exercise-3 with Solution
Write a NumPy program to capitalize the first letter, lowercase, uppercase, swapcase, title-case of all the elements of a given array.
import numpy as np x = np.array(['python', 'PHP', 'java', 'C++'], dtype=np.str) print("Original Array:") print(x) capitalized_case = np.char.capitalize(x) lowered_case = np.char.lower(x) uppered_case = np.char.upper(x) swapcased_case = np.char.swapcase(x) titlecased_case = np.char.title(x) print("\nCapitalized: ", capitalized_case) print("Lowered: ", lowered_case) print("Uppered: ", uppered_case) print("Swapcased: ", swapcased_case) print("Titlecased: ", titlecased_case)
(['python', 'PHP', 'java', 'C++'], dtype=np.str)
Original Array: ['python' 'PHP' 'java' 'C++'] Capitalized: ['Python' 'Php' 'Java' 'C++'] Lowered: ['python' 'php' 'java' 'c++'] Uppered: ['PYTHON' 'PHP' 'JAVA' 'C++'] Swapcased: ['PYTHON' 'php' 'JAVA' 'c++'] Titlecased: ['Python' 'Php' 'Java' 'C++']
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Python: Tips of the Day
Getting the last element of a list:
some_list[-1] is the shortest and most Pythonic.
In fact, you can do much more with this syntax. The some_list[-n] syntax gets the nth-to-last element. So some_list[-1] gets the last element, some_list[-2] gets the second to last, etc, all the way down to some_list[-len(some_list)], which gives you the first element.
You can also set list elements in this way. For instance:
>>> some_list = [1, 2, 3] >>> some_list[-1] = 5 # Set the last element >>> some_list[-2] = 3 # Set the second to last element >>> some_list [1, 3, 5]
Note that getting a list item by index will raise an IndexError if the expected item doesn't exist. This means that some_list[-1] will raise an exception if some_list is empty, because an empty list can't have a last element.
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