codingdirectional: Add one to the last element of a list

Hello and welcome to another one day one answer series. In this article, we will create a python method which will do the following actions.

1. Takes in a list of numbers.
2. If the number is less than 0 or it is a double digits number then returns None.
3. If it is an empty list then returns None.
4. Else joins the numbers in the list together to create a larger number, for example, if a list consists of [1, 2, 3] then the larger number will become 123. Next, add one to that new number, so 123 becomes 124.
5. Finally turns that new number back to a list, so 124 becomes [1, 2, 4] and returns that new list.

Below is the solution for this question.

def up_array(arr):

    str_ = ''
  
    if(len(arr) == 0):
        return None
        
    for num in arr:
        if(num < 0 or num > 9):
            return None
        else:
            str_ += str(num)
    
    total = str(int(str_) + 1)
    arr = []

    for number in total:
        arr.append(int(number))

    return arr

That is it, hope you like this article.

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