In a list program, print statements are not concatenating properly as float

Question

The below is my code, but I can't get the last few lines to print. I've tried rearranging them, switching from string to float, etc. I don't know if this is just a glitch or a concatenation problem. If so, how would I make the last few lines print with float?

N = []
C= []
Holiday = []
totC = 0
name = input("enter name").upper()
while name != "XXX":
    cost = int(input("enter amount to spend >0 and <=10"))
    while cost <=0 or cost >10:
        print("invalid cost")
        cost = int(input("enter amount to spend >0 and <=10"))
    gift = name + " " + str(cost)
    N.append(name)
    C.append(cost)
    Holiday.append(gift)
    totC = totC + cost
    name = input("enter name").upper()

print(Holiday)
print(N)
print(C)
print(totC)
print("Total cost is "  + totC)
print("Average cost is" + av)
print("Number of names is " + len(N))
print("Number of costs is " + len(C))

What input are you providing? And what output is generated for it? — Mureinik, Nov 30 '20 at 23:12
You can use `str(123)` to change numbers to strings so they can be concatenated with other strings. — Chris, Nov 30 '20 at 23:12
What problems are you encountering? If you get an error, then post the full error message. If you get wrong result, then post the result you get and the result you expect. — Ted Klein Bergman, Nov 30 '20 at 23:14
I don't see anything in your code that provides a value for `av`. — Karl Knechtel, Dec 01 '20 at 00:07

score 1 · Answer 1 · answered Nov 30 '20 at 23:49

Forget about casting all those values to strings. You don't need to do that. Instead, write your print statements like:

print("Total cost is", totC)
print("Average cost is", av)
print("Number of names is", len(N))
print("Number of costs is", len(C))

Alternatively, if you're using Python 3.6 or newer, you can use f-strings like:

print(f"Total cost is {totC}")
print(f"Average cost is {av}")
print(f"Number of names is {len(N)}")
print(f"Number of costs is {len(C)}")

Axiumin_ · Answer 2 · 2020-11-30T23:16:41.470

You'll likely have to convert the floats and integers to strings using the str function.

For example, print("Number of costs is " + len(C)) would become print("Number of costs is " + str(len(C))) and print("Total cost is " + totC) would become print("Total cost is " + str(totC))

The print statements should look like this.

print("Total cost is "  + str(totC))
print("Average cost is" + str(av))
print("Number of names is " + str(len(N)))
print("Number of costs is " + str(len(C)))

One thing I noticed is that you don't have a variable called av, so trying to print it would not work. If you're trying to print the average costs, then you can do sum(C)/len(C). So, you can either add av = sum(C)/len(C) right before the print statements, or you can integrate into the print statement, like this:

print("Average cost is" + str(sum(C)/len(C)))

score 0 · Answer 3 · answered Nov 30 '20 at 23:12

0

Use str:

print("Total cost is "  + str(totC))
print("Average cost is" + str(av))
print("Number of names is " + str(len(N)))
print("Number of costs is " + str(len(C)))

You might be confusing concatenation with "addition" of strings and integers.

answered Nov 30 '20 at 23:12

Jack Bashford

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No worries @Julia! – Jack Bashford Nov 30 '20 at 23:17

In a list program, print statements are not concatenating properly as float

3 Answers3