CODEWITHSUNDEEP
pythonpython-3.7
Collin Dee Cortez
Collin Dee Cortez

Reputation: 25

Trying to swap positions in a list

Writing a simple code to print a random list, the swap the first position integer with the last position integer and re-print the list. Keep getting error saying not subscriptable. This is for a basic python class but we are on Thanksgiving break and can't talk to professor, due when we get back. 

import random

def main():

    mylist=[]

    for i in range(15):
        mylist.append(random.randrange(0,25))

    print(mylist)



    def swap():
        a, b = mylist.index[0], mylist.index[14]
        mylist[b], mylist[a] = mylist[a], mylist[b]
        print(mylist)

    swap()

main()

Upvotes: 2

Views: 713

Answers (2)

Chris Charley
Chris Charley

Reputation: 6573

You are swapping with indexes equal to the values in the list (instead of indexes).

Try:

mylist[0], mylist[-1] = mylist[-1], mylist[0]

On another observation, I believe you have to pass mylist to swap as a parameter. (unless swap is defined in main).

Upvotes: 1

Cory L
Cory L

Reputation: 273

You need to hold one of the values in a variable and then swap.

def swap():
    x = mylist[0]
    mylist[0] = mylist[14]
    mylist[14] = x

    print(mylist)

Upvotes: 3

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