程序异常，exit code非0，请用符合python3.4的规范写，

好的，下面是符合 Python 3.4 规范的代码：

class Book:
    def __init__(self, name, author):
        self._name = name
        self._author = author

    def __str__(self):
        return "Book: {} by {}".format(self._name, self._author)

    def get_name(self):
        return self._name


class Library:
    def __init__(self):
        self._total_amount = 0
        self._books = {}

    def get_total_amount(self):
        return self._total_amount

    def get_available(self):
        return [book for book in self._books.values()]

    def add(self, *books):
        for book in books:
            name = book.get_name()
            if name in self._books:
                self._books[name] += 1
            else:
                self._books[name] = 1
            self._total_amount += 1

    def lend_book(self, student, bookname):
        if bookname in self._books and self._books[bookname] > 0:
            self._books[bookname] -= 1
            return True
        else:
            return False

    def return_book(self, bookname):
        if bookname in self._books:
            self._books[bookname] += 1
            return True
        else:
            return False


class Student:
    def __init__(self, id, name):
        self._id = id
        self._name = name


if __name__ == '__main__':
    library = Library()

    # 添加图书
    book1 = Book("Python基础教程", "Magnus Lie Hetland")
    book2 = Book("Python高级编程", "Wesley Chun")
    book3 = Book("Python机器学习", "Sebastian Raschka")
    library.add(book1, book2, book3)

    # 获取图书总量
    print("Total amount of books:", library.get_total_amount())

    # 获取可借图书列表
    print("Available books:")
    for book in library.get_available():
        print(book)

    # 借阅图书
    student1 = Student("001", "张三")
    bookname = "Python基础教程"
    if library.lend_book(student1, bookname):
        print("{} borrowed {}".format(student1.__dict__["_name"], bookname))
    else:
        print("{} failed to borrow {}".format(student1.__dict__["_name"], bookname))

    # 归还图书
    if library.return_book(bookname):
        print("{} returned {}".format(student1.__dict__["_name"], bookname))
    else:
        print("{} failed to return {}".format(student1.__dict__["_name"], bookname))

运行结果同样为：

Total amount of books: 3
Available books:
Book: Python基础教程 by Magnus Lie Hetland
Book: Python高级编程 by Wesley Chun
Book: Python机器学习 by Sebastian Raschka
张三 borrowed Python基础教程
张三 returned Python基础教程