如何在Python 3.x中执行循环功能并输出总和？

Question

I have an assignment that requires using a single "for" statement to calculate the manhattan and euclidian distances of two data sets. I'm also required to define the data sets and zip them as shown in the code. I'm very new to Python, and any tips on how to print the sum of the abs(xy) function would be greatly appreciated!

I'd like the output to read "Manhattan Distance: 22.5"

Here is what I've tried

UserXRatings = [1,5,1,3.5,4,4,3]
UserYRatings = [5,1,5,1,1,1,1]    

for x, y in zip(UserXRatings, UserYRatings):
   print("Manhattan distance: ", abs(x-y))

Answer 1

You can use sum to get desired result-

print("Manhattan distance: ",sum(abs(x-y) for x,y in zip(UserXRatings, UserYRatings)))
#It should print - Manhattan distance:  22.5

Answer 2

You're close. What you're doing is printing the value of abs(xy) each time through the loop. You should probably store the sum of the values as you go through the loop, then print it once at the end:

Python 3.3.3 (v3.3.3:c3896275c0f6, Nov 18 2013, 21:19:30) [MSC v.1600 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> UserXRatings = [1,5,1,3.5,4,4,3]
>>> UserYRatings = [5,1,5,1,1,1,1]
>>>
>>> z = 0  # Initialize the variable to store the running total.
>>> for x, y in zip(UserXRatings, UserYRatings):
...     z = z + abs(x-y)  # Calculate the running total of `abs(x-y)`.
...
>>> print("Manhattan distance: ", z)
Manhattan distance: 22.5
>>>