Question

Python

A good friend of yours sent you a long list of recipe names in a text file (where each line is a recipe that also includes information about how long it takes to do the recipe). You only want to know about the recipes that involve chocolate and are fast (i.e., take 15 mins or less to prepare). Write the program for this!

Write a program to -
      + Find recipes that involve chocolate that can be done in 15 mins or less (aka "fast chocolate" recipes) from the file named my-recipes.txt (attachment)
      + Print out the total number of "fast chocolate" recipes
      + Print out that list of "fast chocolate" recipes in a readable form (i.e., line by line, without extra whitespace like newlines).

Your output should look something like -

      We found 5 fast chocolate recipes!
      Here they are:
      Chocolate Covered Oreos | 5 mins
      Chocolate Pudding | 8 mins
      Chocolate Cheesecake Bars | 15 mins
      Chocolate-Covered Cake Balls | 12 mins
      Death by Chocolate Brownies | 10 mins

my-recipes.txt:

Samoa Dessert Lasagna | 45 mins
Birthday Cake | 25 mins
Oreo Truffles | 15 mins
Chocolate Covered Oreos | 5 mins
Chocolate Pudding | 8 mins
Vanilla Pudding | 10 mins
Cookie Dough Ice Cream Sandwiches | 15 mins
Neapolitan Bundt Cake | 15 mins
Swiss Roll Cake | 15 mins
Chocolate Cheesecake Bars | 15 mins
Confetti Squares | 20 mins
Chocolate-Covered Cake Balls | 12 mins
Chess Pie | 15 mins
Brownie Lasagna | 25 mins
Chocolate-Covered Cherries | 18 mins
Pumpkin Cheesecake Roll | 15 mins
Reese's Stuff Rice Krispies Treats | 15 mins
Death by Chocolate Poke Cake | 35 mins
Blueberry Cheesecake Egg Rolls | 15 mins
Peanut Butter No-Bake Cookies | 15 mins
Strawberry Cheesecake Stuffed Cupcakes | 15 mins
No-Bake Cheesecake | 15 mins
Mrs. Fields Chocolate Chip Cookies | 20 mins
Nutella Pops | 15 mins
Death by Chocolate Brownies | 10 mins
S'mores Grilled Cheese | 15 mins
Cookie Dough Fudge | 15 mins
Checkerboard Cake | 25 mins
Cookiedilla | 10 mins
S'mores Poke Brownies | 15 mins

Answer 1

import re

chocolate_recipes = list()
fast_chocolate_recipes = list()
filename = "my-recipes.txt"
regexp = re.compile(r'[cC]hocolate')

# Open the txt file and put each of the recipes in a list
with open(filename) as f:
    recipes = f.readlines()
recipes = [recipe.strip() for recipe in recipes]

# Search for the word "Chocolate"/"chocolate" using regex in the recipes list 
# and put all chocolate recipes in one single list
for recipe in recipes:
    if regexp.search(recipe):
        chocolate_recipes.append(recipe)

# For each chocolate recipes, strip out the portion before "|" and also strip out the mins (the number) taken
# from the remaining string. Covert the number from str to int and check if its a fast chocolate recipe
for chocolate_recipe in chocolate_recipes:
    time = chocolate_recipe.split('| ')[1].split(' mins')[0]
    if int(time) <= 15:
        fast_chocolate_recipes.append(chocolate_recipe)

print(f"We found {len(fast_chocolate_recipes)} fast chocolate recipes!")
print("Here they are: ")
for fast_chocolate_recipe in fast_chocolate_recipes:
    print(fast_chocolate_recipe)