CODEWITHSUNDEEP
pythonlistfunction
Here2Learn
Here2Learn

Reputation: 33

Appends new item to end of list with the value (last item + 1)

I am trying to define a function where: This function takes a single argument which is a list name itself. It will then look at the value of the last existing item in the list, it will then append a new value that is one unit bigger. This is what I have:

    my_list = [ 1, 2, 3, 4, 5 ]

    def add_item_to_list(ordered_list):
        for (num[-1]) in ordered_list:
        ordered_list.append(num[-1] + 1)
    # Appends new item to end of list with the value (last item + 1)

But I get this error: 

File "<stdin>", line 1, in <module>
File "<stdin>", line 2, in add_item_to_list
NameError: name 'num' is not defined

Upvotes: 0

Views: 70

Answers (2)

Maurice Meyer
Maurice Meyer

Reputation: 18106

You need no for-loop:

my_list = [ 1, 2, 3, 4, 5 ]

def add_item_to_list(ordered_list):
    ordered_list.append(ordered_list[-1] + 1)
    return ordered_list

print(add_item_to_list(my_list))

Output:

[1, 2, 3, 4, 5, 6]

Upvotes: 2

quamrana
quamrana

Reputation: 39354

You can have code which does as you describe

def add_item_to_list(ordered_list):
    last_item = ordered_list[-1]
    ordered_list.append(list_item + 1)

Upvotes: 1

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