How to use list-CodePudding

I am trying to write a program that retrieves user input for sales for every weekday and then calculates the total. What I have got so far looks like this.

days = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday']

index = 0

def sales_by_days(days):
while index < len(days)
sales1 = float(input("Enter sales for", days[0], "here. "))
// then repeat for the rest of the elements //
index  = 1
totalsales = sales1   sales2   sales3   sales4   sales5
print ("Your total sales for the week are", totalsales, ". ")`

It's not really having the desired results. Can anybody give me some pointers on where I am going wrong?

CodePudding user response：

You can use for loop instead of while loop here,

days = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday']

def sales_by_days(days):
    totalsales = 0
    for day in days:
        sales = float(input(f"Enter sales for {day} here. "))
        totalsales  = sales
    print(f"Your total sales for the week are {totalsales} .")

Execution:

Enter sales for Monday here. 10
Enter sales for Tuesday here. 2
Enter sales for Wednesday here. 4
Enter sales for Thursday here. 6
Enter sales for Friday here. 8
Your total sales for the week are 30.0 .

CodePudding user response：

If your goal is to receive user input for each day's sales and calculate the sum, you must either add to a global variable total sales on every loop iteration or store each of the sales in a global list variable sales and take its sum afterwards.

# Your solution modified
days = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday']
index = 0
total_sales = 0
def sales_by_days(days):
    while index < len(days):
        total_sales  = float(input("Enter sales for", days[index], "here. "))
        index  = 1
    print ("Your total sales for the week are", total_sales, ". ")`

# Maybe a cleaner, simpler solution
def sales_by_days():
    days = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday']
    total = 0
    for day in days:
        total  = float(input("Enter sales for ", day, " here."))
    print("Your total sales for the week are ", total_sales, ".")`

CodePudding user response：

To maintain academic integrity, I have approached the problem in a different manner. However, the process (and learning) should remain similar and consequently this response should be useful.

sales_quantity = {'monday': 0.0, 'tuesday': 0.0, 'wednesday': 0.0, 'thursday': 0.0, 'friday': 0.0, 'saturday': 0.0, 'sunday': 0.0}

for day in sales_quantity.keys():
    sales_quantity[day] = round(float(input("Enter the sales quantity for "   day   ": ")), 2) 

for day, quantity in sales_quantity.items():
    print(f"The sales quantity for {day} is {str(quantity)}")

total_quantity = sum(sales_quantity.values())

print(f"The total quantity this week is {total_quantity}")

The dictionary sales_quantity contains an 'attribute' of keys and values. You may invoke the .keys() or .values() of any dictionary to return the "dict_keys" or "dict_values" object. This object may be iterated through in an identical manner of a list object. The advantage of using a dictionary over two separate lists, however, is the interlinking of the lists with a single object.

In the for day in sales_quantity.keys(), you are iterating through the de-facto 'list' (really the type dict_keys). You assign each of the individual instances to the variable day.

The round(val, 2) is used to clean the input. Otherwise, a user may input unreasonable values.

The sales_quantity[day] = var is used to alter the data into the dictionary.

The print(f" indicates to use the format print method. This allows you to embed variables easily.