list index out of range python how to fix code example

Example 1: python list index out of range

#this will result in an IndexError
arr = ['item',1,None,'hi']
error = arr[10]

Example 2: list index out of range

def sort_list(l):
    l=list(l)
    for i in l:
        if l[i]<=l[i+1]:
            return True
        else:
            return False