Exercise

More string operators and Twitter

In this exercise, you will apply different string operators to three strings, selected from the tweets dataset. A tweets_list has been created for you.

You need to construct three new lists by applying different string operators:

a list retaining only letters
a list retaining only characters
a list retaining only digits

The required functions have been imported for you from nltk.

Instructions

100 XP

Create a list of the tokens from tweets_list.
In the list letters remove all digits and other characters, i.e. keep only letters.
Retain alphanumeric characters but remove all other characters in let_digits.
Create digits by removing letters and characters and keeping only numbers.