Question

Write the following Python script:

Problem Statement

We want to know how many different people have eaten at a restaurant this past week. The parameter meals has strings in the format "name:restaurant" for a period of time. Sometimes a person eats at the same restaurant often.

Return the number of different people who have eaten at the eating establishment specified by parameter restaurant.

For example, "John Doe:Moes" shows that John Doe ate one meal at Moes.

Write function howMany that given meals, a list of strings in the format above indicating where each person ate a meal, and restaurant, the name of a restaurant, returns the number of people that ate at least one meal at that restaurant.

Constraints

• meals is a list with 0 or more strings. Each string is in the format above, so each string has length at least 3 and contains a colon. The string before the ":" and the string after it are at least one character long.
• len(restaurant) >=1

Check your work with the following examples:

------------------------------------------------------------

meals = ["Sue:Elmos"]

restaurant = "Guglhupf"

returns 0

------------------------------------------------------------

meals = []

restaurant = "Sushi Love"

returns 0

------------------------------------------------------------

meals = ["Sue:Elmos", "Sue:Elmos", "Sue:Elmos"]

restaurant = "Elmos"

returns 1

------------------------------------------------------------

meals = ["Sue:Elmos", "Joe:Mad Hatter", "Sue:Mad Hatter", "Kristin:Sitar"]

restaurant = "Mad Hatter"

returns 2

------------------------------------------------------------

meals = ["Sue:Elmos", "Joe:Mad Hatter", "Sue:Mad Hatter", "Bill:Elmos", "Owen:Elmos", "Joe:Mad Hatter", "Sue:Mad Hatter", "Nora:Elmos", "Nora:Sitar", "Joe:Elmos","Mary:Sitar"]

restaurant = "Mad Hatter"

returns 2

------------------------------------------------------------

meals = ["Sue:Elmos", "Joe:Mad Hatter", "Sue:Mad Hatter", "Bill:Elmos", "Kristin:Sitar", "Owen:Elmos", "Joe:Mad Hatter", "Sue:Mad Hatter", "Nora:Elmos", "Nora:Sitar", "Joe:Elmos", "Mary:Sitar", "Joe:Elmos", "Mary:Sitar", "Kristin:Sitar"]

restaurant = "Elmos"

returns 5

Answer 1

I have uploaded the Images of the code, Typed code and Output of the Code. I have provided explanation using comments (read them for better understanding).

Images of the Code:
Note: If the below code is missing indentation please refer code Images

Typed Code:

# A function named howMany
# with input parameters meals (a list of strings) and restaurant (a string)
def howMany(meals,restaurant):
# A list to store person names
# who visited the restaurant
customers = []
  
# for all values in list of meals
for x in meals:
# spliting the person name and restaurant name
# using split function
person_name,restaurant_name = x.split(":")
# if the restaurant_name is same function parameter restaurant
if(restaurant_name == restaurant):
# checking whether person_name is not in the list of customers
if person_name not in customers:
# appending then person name into the customers list
customers.append(person_name)
# Note: inserting into the customers list only if name is not in list
# as sometimes same person eats at the restaurant more than once
  
# returning length of customers list
return len(customers)

# A list of meals
meals = ["Sue:Elmos"]
# name of the restaurant
restaurant = "Guglhupf"
# calling function howMany with parameters meals and restaurant
# and printing the returned value
print("Number of People ate at ",restaurant ,"are ",howMany(meals, restaurant))

# A list of meals
meals = []
# name of the restaurant
restaurant = "Sushi Love"
# calling function howMany with parameters meals and restaurant
# and printing the returned value
print("Number of People ate at ",restaurant ,"are ",howMany(meals, restaurant))

# A list of meals
meals = ["Sue:Elmos", "Sue:Elmos", "Sue:Elmos"]
# name of the restaurant
restaurant = "Elmos"
# calling function howMany with parameters meals and restaurant
# and printing the returned value
print("Number of People ate at ",restaurant ,"are ",howMany(meals, restaurant))

# A list of meals
meals = ["Sue:Elmos", "Joe:Mad Hatter", "Sue:Mad Hatter", "Kristin:Sitar"]
# name of the restaurant
restaurant = "Mad Hatter"
# calling function howMany with parameters meals and restaurant
# and printing the returned value
print("Number of People ate at ",restaurant ,"are ",howMany(meals, restaurant))
#code ended here

Output:

If You Have Any Doubts. Please Ask Using Comments.

Have A Great Day!