Question

Python homework

Write a function called insert_value(my_list, value, insert_position) that takes a list, a value and an insert_position as parameters. The function returns a copy of the list with the value inserted into the list (my_list) at the index specified by insert_position.

Check for the insert_position value exceeding the list (my_list) bounds.

if the insert_position is greater than the length of the list, insert the value at the end of the list.

if the insert_position is less than or equal to zero, insert the value at the start of the list.

You must use a loop(s) in your solution. You may make use of the list_name.append(item) method in order to build the new list. You must not use built-in functions (other than the range() function), slice expressions, list methods (other than the append() method) or string methods in your solution.

This what I come up with the above. But I am not getting the answer correct.

def insert_value(my_list, value, insert_position):

    # get the length of the list    

    count = 0

    for item in my_list:

        count += 1

    new_list = []

    for i in range(0,  count + 1):        

        if insert_position > i:

            new_list.append(my_list[i])    

        elif insert_position == i:

            new_list.append(value)

        else:

            new_list.append(my_list[i-1])

    return new_list

str_list3 = ['one','three','four', 'five', 'six']

new_list = insert_value(str_list3, 'two', 1)

print(new_list)

str_list4 = ['i', 't']

str_list4 = insert_value(str_list4, 'p', 0)

print(str_list4)

str_list4 = insert_value(str_list4, 's', -1)

print(str_list4)

str_list4 = insert_value(str_list4, 's', 7)

print(str_list4)

Answer 1

def insert_value(my_list,value,insert_position):
#Initializing a new list for the copy of my_list
    new_list = []
#Finding the length of my_list
    count = 0
    for i in my_list:
        count += 1
#Check if the insert_position is greater than or equal length
#return the new list by copying my_list into new_list append
#appending value to the list end
    if insert_position >= count:
        new_list = my_list
        new_list.append(value)
        return new_list
#Check if the insert_position is less than or equal to 0
#return the new list by first appending value into new_list and
#appending my_list to the list end
    if insert_position <= 0       :
        new_list.append(value)
        for i in range(count):
            new_list.append(my_list[i])
        return new_list
#Iterate through each index of the list and check index = insert_position
#append new_list with my_list until index = insert_position
#if index equals insert_position append the value and append remaining
#my_list to new_list
    else:
        for i in range(count):
            if (i == insert_position):
                new_list.append(value)
            new_list.append(my_list[i])
        return new_list

#Test run of the function
print insert_value(['a','b','c'],'test',2)
print insert_value(['a','b','c'],'test',6)
print insert_value(['a','b','c'],'test',0)
print insert_value(['a','b','c'],'test',-1)

SAMPLE OUTPUT: