﻿ NumPy: Make the length of each element 15 of a given array and the string centered / left-justified / right-justified with paddings of _ - w3resource # NumPy: Make the length of each element 15 of a given array and the string centered / left-justified / right-justified with paddings of _

## NumPy String: Exercise-4 with Solution

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 _.

Sample Solution:-

Python Code:

``````import numpy as np
x = np.array(['python exercises', 'PHP', 'java', 'C++'], dtype=np.str)
print("Original Array:")
print(x)
centered = np.char.center(x, 15, fillchar='_')
left = np.char.ljust(x, 15, fillchar='_')
right = np.char.rjust(x, 15, fillchar='_')
print("\nCentered =", centered)
print("Left =", left)
print("Right =", right)
```
```

Sample Input:

```(['python exercises', 'PHP', 'java', 'C++'], dtype=np.str)
```

Sample Output:

```Original Array:
['python exercises' 'PHP' 'java' 'C++']

Centered = ['python exercise' '______PHP______' '______java_____' '______C++______']
Left = ['python exercise' 'PHP____________' 'java___________' 'C++____________']
Right = ['python exercise' '____________PHP' '___________java' '____________C++']
```

Pictorial Presentation: Python Code Editor:

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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.

Ref: https://bit.ly/3d8TfFP