写个代码：Python背单词记单词小程序，可自定义词库，支持多种记忆模式，根据词义拼写、选择单词，根据词意选择单词，可乱序抽查，可对错题进行反复抽查

好的，以下是基本框架和伪代码：

import random

class Word:
    def __init__(self, word, meaning):
        self.word = word
        self.meaning = meaning

class Vocabulary:
    def __init__(self):
        self.words = []

    def add_word(self, word, meaning):
        self.words.append(Word(word, meaning))

class Quiz:
    def __init__(self, vocabulary):
        self.vocabulary = vocabulary
        self.mode = None
        self.current_word = None
        self.score = 0
        self.wrong_words = []

    def set_mode(self, mode):
        self.mode = mode

    def get_word(self):
        if self.mode == "spelling":
            self.current_word = random.choice(self.vocabulary.words)
        elif self.mode == "meaning":
            self.current_word = random.choice(self.vocabulary.words)
        # add more modes here

    def get_options(self):
        if self.mode == "spelling":
            # return shuffled letters of the current word
        elif self.mode == "meaning":
            # return shuffled meanings of other words
        # add more modes here

    def check_answer(self, answer):
        if self.mode == "spelling":
            if answer == self.current_word.word:
                self.score += 1
            else:
                self.wrong_words.append(self.current_word)
        elif self.mode == "meaning":
            if answer == self.current_word.meaning:
                self.score += 1
            else:
                self.wrong_words.append(self.current_word)
        # add more modes here

    def review_wrong_words(self):
        # re-quiz the wrong words
        pass

# example usage
vocabulary = Vocabulary()
vocabulary.add_word("apple", "a fruit")
vocabulary.add_word("banana", "a fruit")
vocabulary.add_word("carrot", "a vegetable")

quiz = Quiz(vocabulary)
quiz.set_mode("spelling")
for i in range(10):
    quiz.get_word()
    options = quiz.get_options()
    # present options to user and get answer
    quiz.check_answer(answer)

quiz.set_mode("meaning")
for i in range(10):
    quiz.get_word()
    options = quiz.get_options()
    # present options to user and get answer
    quiz.check_answer(answer)

quiz.review_wrong_words()

需要自己实现一些细节，比如乱序、答案选项的生成和展示等。