NumPy: Insert a space between characters of all the elements of a given array
NumPy String: Exercise-5 with Solution
Write a NumPy program to insert a space between characters of all the elements of a given array.
import numpy as np x = np.array(['python exercises', 'PHP', 'java', 'C++'], dtype=np.str) print("Original Array:") print(x) r = np.char.join(" ", x) print(r)
(['python exercises', 'PHP', 'java', 'C++'], dtype=np.str)
Original Array: ['python exercises' 'PHP' 'java' 'C++'] ['p y t h o n e x e r c i s e s' 'P H P' 'j a v a' 'C + +']
Python Code Editor:
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Previous: Write a NumPy program to make the length of each element 15 of a given array and the string centered / left-justified / right-justified with paddings of _.
Next: Write a NumPy program to encode all the elements of a given array in cp500 and decode it again.
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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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