# python demo script to illustrate dictionary usage to replace words in a sentence Input is word pairs exactly with same whitespaces as here: Hi Hello Thanks Thank-you Bye Goodbye (one space between...

# python demo script to illustrate dictionary usage to replace words in a sentence
Input is word pairs exactly with same whitespaces as here:

Hi Hello  Thanks Thank-you  Bye Goodbye

(one space between pairs, two spaces between every pairs)
In a user's input sentence example as follows:

Hi there, Thanks, Bye

using the above given pairs as a dictionary to replace corresponding words in the input sentence, and the output becomes:
Hello there, Thank-you, Goodbye

Read input from user, first word pairs, then the sentence, split, loop over elements to replace what's entered from pair words into entered sentence.
Comments are very important so I can understand. Thanks