Imagine you have a text file where each line consists of an item name, a colon, and a number, like this: item1:100 item2:35 item3:48 You can assume that the numbers will always be greater than or equal to zero. Write a function called max_itemo that satisfies the following specifications: Your function should take one argument: the name of a text file whose contents are formatted as described above. You can assume that the name of the file is a string and that the file actually exists. Your function should use a with statement to open the file from the argument for reading. Your function should read each line in the file. Your function should return (not print!) the largest number from the file. In the case of the example file above, your function should return the number 100. . Your program should not import any modules or include any code outside of your function. You do not need to write any docstrings. You do not need to follow normal course style conventions regarding variable names or the length of lines of code