import sys
import random

# I don't know any German, but I know a little Spanish so I went that route
english_to_spanish = {"hello": "hola", "thing": "cosa", "dog": "perro",
        "cat": "gato", "big": "grande", "telephone": "telefono",
        "beer": "cerveza", "more": "mas", "fat": "gordo"}

option = raw_input("Choose <E>nglish to Spanish or <S>panish to English:")
num_of_words = int(raw_input("How many words do you want to translate?"))
correct_answers = 0.0  # making this a float allows the percentage calculation at end of script
missed_answers = []

if num_of_words > len(english_to_spanish):      # if you're going to have 1000 words you can
    print "I don't even know that many words!"  # probably get rid of this if block
    sys.exit()

if option.lower() == "e":
    word_list = random.sample(english_to_spanish, num_of_words)
    for word in word_list:
        print "\nEnglish: " + word
        answer = raw_input("Enter the Spanish translation:")
        if answer.lower() == english_to_spanish[word]:
            print "That's right!"
            correct_answers += 1
        else:
            print "Sorry, that's not right."
            missed_answers.append(english_to_spanish[word])

elif option.lower() == "s":
    span_words = random.sample(english_to_spanish, num_of_words)
    for word in span_words:
        print "\nSpanish:" + english_to_spanish[word]
        answer = raw_input("Enter the English translation:")
        if answer.lower() == word:
            print "You got it!"
            correct_answers += 1
        else:
            print "Oops. That's not right."
            missed_answers.append(word)
else:
    print "I don't understand that."
    sys.exit()

percentage = (correct_answers / num_of_words) * 100
print "You got %d out of %d words right! That's %d percent!" % \
    (correct_answers, num_of_words, percentage)
print "You missed these words: "
for miss in missed_answers:
    print miss,