Pile Pop And Size

Write the whole Pile class. The constructor takes no arguments and creates an empty list attribute items; push(value) adds a whole number to the end with .append(); pop() removes the last value with .pop() and returns it; size() returns how many values remain. Do NOT write a main block or any top-level test code; the tests construct the class. Input: one line of whole numbers separated by spaces, which the tests push in order; they then print the size, the value pop returns, and the size again, each on its own line.