python - Subtraction of two items from two lists in for command

Question

I'm fairly new to Python and I still do basic stuff for my ICT course.

I have a task to create a program that catches foreign number plates that are speeding. I have done times of entry and leave, which would be later assigned to 10 different number plates (that bit isn't important).

To save space, I'm trying to use the for command on the Leave and Enter lists hoping to take away Enter's item from Leave's item, to get the time it took for a car to get from Camera A to B in the program.

How can I do it effectively? Here's something I tried, although I know why it's wrong, I can't find a solution anywhere.

import itertools

Enter=[7.12,
       7.14,
       7.24,
       7.45,
       7.28,
       7.31,
       7.18,
       7.25,
       7.33,
       7.38] #A list for the times of cars passing Camera A

Leave=[7.56,
       7.24,
       7.48,
       7.52,
       7.45,
       7.57,
       7.22,
       7.31,
       7.37,
       7.41] #A list for the times of cars passing Camera B

Timestaken=[]

for item in itertools.chain(Leave,Enter):
    Timestaken.append(item-item)

print(Timestaken)

Answer 1

I think you're looking for zip

Enter=[7.12,
       7.14,
       7.24,
       7.45,
       7.28,
       7.31,
       7.18,
       7.25,
       7.33,
       7.38] #A list for the times of cars passing Camera A

Leave=[7.56,
       7.24,
       7.48,
       7.52,
       7.45,
       7.57,
       7.22,
       7.31,
       7.37,
       7.41] #A list for the times of cars passing Camera B

for enter_data, leave_data in zip(Enter, Leave):
    print(leave_data - enter_data)