from random import randrange

def countitems(item, lst):
    '''
    Purpose: Count the number of occurrences of elt in lst.
    Pre:  lst is a list, and item is any value.
    Post: Returns the number of elements of lst that are
          equal to item.
    '''
    result = 0

    for elt in lst:
        if elt == item:
            result += 1

    return result


def main():
    '''Driver program for testing countitems.'''

    # Random list of integers
    intlist = [ ]
    for i in range(20):
        intlist.append(randrange(10))

    print("Integer test list:", intlist)

    okay = True
    # Going up to 10 because the values in the list only go up to 9.
    # That way we know the last answer should be zero.
    for i in range(11):
        mycount = countitems(i, intlist)
        official = intlist.count(i)
        if mycount != official:
            print("Incorrect count", mycount, "for", i,
                  ", should be", official)
            okay = False
        else:
            print("Correct count", mycount, "for", i)
    if okay:
        print("All tests passed successfully.")

main()