Can someone please help me with the Tax Code Coach challenge in Python? I passed 5/6 cases, but can't figure out the last one.

Question

input = input()

purchase = input.split(',')

taxed = []
untaxed =[]
for i in range(0, len(purchase)):
purchase[i] = float(purchase[i])
if purchase[i] < 20:
taxed.append(purchase[i])
taxed_sum = (sum(taxed) * 1.07)
elif purchase[i] >= 20:
untaxed.append(purchase[i])
untaxed_sum = sum(untaxed)

total = taxed_sum + untaxed_sum
print(round(total, 2))

Answer 1

# Hi, linda !

# Just declare the variables taxed_sum and untaxed_sum before you start use them,
# and the code will work, like this:

purchase = input().split(",")
taxed, untaxed = [], []
taxed_sum = untaxed_sum = 0
for i in range(len(purchase)):
purchase[i] = float(purchase[i])
if purchase[i] < 20:
taxed.append(purchase[i])
taxed_sum = sum(taxed) * 1.07
elif purchase[i] >= 20:
untaxed.append(purchase[i])
untaxed_sum = sum(untaxed)

total = taxed_sum + untaxed_sum
print(round(total, 2))

# - - - - -
# Also avoid call the variable input the same as the built-in function input, like input = input().
# (For example inp = input() is better) Otherwise it is, or can be, confusing.

Answer 2

# Hi, linda !

# Yes, it is.

# Maybe the code below is more easy to understand. f-string formating is good
# for formting outputs. You can compare the 0.2f after the colon with
# round(total, 2).

# List comprehension is a compact way create lists and handle nestle lops
# and conditions. But they are not good if the become to complex.

# in costs I hadle both cases at the same time: if x < 20 then add taxes,
# otherwise not. This makes the code more compact.

inp = input().split(',')
purchases = [float(x) for x in inp]
costs = [(x*1.07 if x < 20 else x) for x in purchases]
total = sum(costs)
print(f"{total:0.2f}")!

Answer 3

Oh wow, thank you so much for the tips!

Answer 4

# Hi, linda ! Or as a oneliner:

print(f"{sum(x*1.07 if x < 20 else x for x in (float(s) for s in input().split(','))):.2f}")

Answer 5

THANK YOU!

Answer 6

Here is the Coach Coach question, I couldn't fit it above.

You are shopping at a store that is having a special where you do not have to pay the tax on anything that costs 20 dollars or more!
If you have a list of prices for all of your items, what is your total once the tax is added in? Tax is 7% on the items that you would still need to pay tax on.

Task:
Determine the total cost once you include tax of 7% on the items that are still taxed.

Input Format:
A string of numbers, separated by commas, that represent to price of each item that you are going to buy.

Output Format:
A number, rounded to two decimal places, of the total for your purchase once tax is included on items under 20 dollars.

Sample Input:
5,18,25,34

Sample Output:
83.61

Answer 7

Per Bratthammar I want to learn how to write shorter code. Is this F-Strings and list comprehension?