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.

This exercise is part of the course

Sentiment Analysis in Python

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Exercise instructions

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.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Create a list of lists, containing the tokens from list_tweets
tokens = [____(item) for item in tweets_list]

# Remove characters and digits , i.e. retain only letters
letters = [[word for word in item if ____.____] for item in tokens]
# Remove characters, i.e. retain only letters and digits
let_digits = [[word for word in item if ____.____] for item in tokens]
# Remove letters and characters, retain only digits
digits = [[word for word in item if ____.____] for item in tokens]

# Print the last item in each list
print('Last item in alphabetic list: ', letters[2])
print('Last item in list of alphanumerics: ', let_digits[2])
print('Last item in the list of digits: ', digits[2])

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