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Python: Replace whitespaces with an underscore and vice versa

Python Regular Expression: Exercise-23 with Solution

Write a Python program to replace whitespaces with an underscore and vice versa.

Sample Solution:-

Python Code:

import re
text = 'Python Exercises'
text =text.replace (" ", "_")
print(text)
text =text.replace ("_", " ")
print(text)

Sample Output:

Python_Exercises                                                                                              
Python Exercises

Pictorial Presentation:

Python: Regular Expression - Replace whitespaces with an underscore and vice versa.
Python: Regular Expression - Replace whitespaces with an underscore and vice versa.

Flowchart:

Flowchart: Regular Expression - Replace whitespaces with an underscore and vice versa.

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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