How do I add two lists together to create one final list

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I have two lists one called free hours and one called hoursbookedlist and I want to add them together to a list called total hours booked

#Imports Time
import random
import time

freehours = []
nameslist = []
hoursbookedlist = []
totalhoursbooked = []
for student in range(7):
name = input("Enter students name ")
hoursbooked = int(input("Enter number of hours booked for the students "))
while (hoursbooked <10):
print("Please re-enter number of hours booked: ")
hoursbooked = int(input("please the number of hours that have been booked for stundent1 "))
if hoursbooked > 10 and hoursbooked < 15:
freehours.append(1)
elif int(hoursbooked >=15):
freehours.append(2)

nameslist.append(name)
hoursbookedlist.append(hoursbooked)

totalhoursbooked = freehours + hoursbookedlist

print ("student \t hoursbooked \t freehours \t totalhoursbooked")
for i in range(7):
print(nameslist[i],"\t","\t",hoursbookedlist[i],"\t","\t",freehours[i],"\t","\t", totalhoursbooked[i])

What I have tried:

I tried just doing totalhoursbooked = freehourslist + hoursbookedlist

Posted 8-Jan-17 3:24am

Member 12939713

Updated 8-Jan-17 4:11am

Richard MacCutchan

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Thomas Daniels 8-Jan-17 10:00am

I'm not sure I understand what you ask... do you mean that you just want a new list with the same number of elements as freehourslist and hoursbookedlist, and each element in totalhoursbooked is the sum of the corresponding elements in freehourslist and hoursbookedlist? Like if you have [1, 1, 1, 1, 1, 1, 1] and [11, 12, 13, 14, 11, 12, 13], you want to have [12, 13, 14, 15, 12, 13, 14]?

Member 12939713 8-Jan-17 10:01am

yeah exactly that

3 solutions

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Richard MacCutchan · Answer 1 · 2017-01-08T03:52:00

Solution 1

You already have an answer to this question at How do I get past LIST INDEX OUR of RANGE ERROR on Python[^]. Please do not repost; if you have information to add then edit your original question.

Posted 8-Jan-17 3:52am

Richard MacCutchan

Comments

Thomas Daniels 8-Jan-17 9:55am

It is actually another question... but then again I'm not so sure what he's asking here.

Member 12939713 8-Jan-17 9:56am

how dont u understand how to I add the free hours and hours booked totherther so in the total hours booked list I have the answers

Richard MacCutchan 8-Jan-17 10:02am

Do you mean add the two lists, or add the contents? If the latter then a simple loop will do it:
Hide Copy Code
for i in range(len(freehourslist)): totalhoursbooked.append(freehourslist[i] + hoursbookedlist[i])

See Peter Leow's excellent solution below.

Member 12939713 8-Jan-17 10:03am

ok but where in program does that go and at top do I need totalhoursbooked = []

Richard MacCutchan 8-Jan-17 10:12am

Well it needs to go after the other two lists have been populated with values, and before you try to print its contents.

Peter Leow 8-Jan-17 10:22am

5ed for excellent teamwork!

Richard MacCutchan 8-Jan-17 11:16am

But your answer was so much more elegant.

Peter Leow · Answer 2 · 2017-01-08T04:03:00

Solution 2

Try and adapt from this example:

list1 = [1,2,3,4]
list2 = [5,6,7,8]
list3 = [sum(x) for x in zip(list1, list2)]

Learn more about zip in Python[^]

Posted 8-Jan-17 4:03am

Peter Leow

Updated 8-Jan-17 4:09am

v2

Comments

Member 12939713 8-Jan-17 10:05am

thank you I managed

Thomas Daniels · Answer 3 · 2017-01-08T04:11:00

There are a few different ways to do that.

The simplest way is using a loop, as mentioned in Richard's comment.

You can also use operator.add and the map command:

Python

import operator
totalhoursbooked = list(map(operator.add, freehourslist, hoursbookedlist))

See the documentation of map[^]:

Quote:
Return an iterator that applies function to every item of iterable, yielding the results.

Then the list function transforms this iterator into a list.

You can also use a combination of list comprehension[^] and the zip function[^].

Python

totalhoursbooked = [a + b for a, b in zip(freehourslist, hoursbookedlist)]

Zip makes an iterator that aggregates elements from each of the iterables passed as arguments. (If you'd convert the zip return value to a list, you'd see a list of tuples where each tuple contains an element from freehourslist with the corresponding hoursbookedlist element).

How do I add two lists together to create one final list

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