import random
import time


def list_max(lst):
    biggest = lst[0]
    for elt in lst:
        if elt > biggest:
            biggest = elt
    return biggest


def list_max_better(lst):
    if len(lst) == 0:
        raise Exception("Input lst must have at least one value")
    return list_max(lst)


def list_max_even_better(lst):
    if len(lst) == 0:
        raise Exception("Input lst must have at least one value")
    biggest = lst[0]
    for elt in lst:
        try:
            if elt > biggest:
                biggest = elt
        except TypeError:
            raise Exception("Elements of lst must be comparable")
    return biggest


def get_scores():
    print("Enter the scores one at a time.  Blank score finishes.")

    scores = []
    line = input("Enter score: ")
    while line != "":
        scores.append(float(line))
        line = input("Enter score: ")
    return scores


def get_scores_better():
    print("Enter the scores one at a time.  Blank score finishes.")

    scores = []
    line = input("Enter score: ")
    while line != "":
        try:
            scores.append(float(line))
        except ValueError:
            print("Please only enter decimal numbers")
    return scores


def print_file_stats(filename):
    file = open(filename, "r")
    longest = ""
    shortest = ""
    total_length = 0
    count = 0
    for word in file:
        word = word.strip()
        if len(word) > len(longest):
            longest = word
        if shortest == "" or len(word) < len(shortest):
            shortest = word
        total_length += len(word)
        count += 1
    file.close()
    print("Number of words: " + str(count))
    print("Longest word: " + longest)
    print("Shortest word: " + shortest)
    print("Avg. word length: " + str(float(total_length) / count))


def print_file_stats_better(filename):
    try:
        print_file_stats(filename)
    except FileNotFoundError:
        print("File doesn't exist, no stats available")
    except ZeroDivisionError:
        pass