Made this because I was bored.

typing_speed_calculator.py

#!/usr/bin/python3

import time, random

sentences = [
    'Is there a time limit on fortune cookie predictions?',
    'I know the voices in my head aren\'t real, but sometimes their ideas just absolutely awesome!',
    'I got a job at a bakery because I kneaded dough.',
    '“Work fascinates me” I can look at it for hours!',
    'How come cats butts go up when you pet them?',
    'Hard work never killed any body. But why take the risk?'
]


def calculate_speed(start_time, end_time, sentence):
    
    words_count           = len(sentence.split())
    char_count            = len(sentence)

    complete_time         = round(end_time - start_time, 2)
    words_per_second      = round(words_count / complete_time, 1)
    characters_per_second = round(char_count / complete_time, 1)

    return [complete_time, words_per_second, characters_per_second]


if __name__ == "__main__":

    for sentence in sentences:
        print (f'Carefully rewrite the sentence below.\n\n{sentence}\n')
        start_time = time.time()
        user_input = input('>> ')
        if user_input != sentence:
            print('You spell it wrong. Moving forward.')
        else:
            end_time = time.time()
            result = calculate_speed(start_time, end_time, sentence)
            print(f'\nIt took you {result[0]} seconds.')
            print(f'Your speed is {result[1]} words per second and {result[2]} characters per second.')