以下是一个便携式图书馆检查的示例代码，用于检查图书馆中是否有可用的图书和借阅记录。

class Book:
    def __init__(self, title, author, available=True):
        self.title = title
        self.author = author
        self.available = available

class Library:
    def __init__(self, books):
        self.books = books

    def check_available_books(self):
        available_books = []
        for book in self.books:
            if book.available:
                available_books.append(book)
        return available_books

    def check_borrowed_books(self):
        borrowed_books = []
        for book in self.books:
            if not book.available:
                borrowed_books.append(book)
        return borrowed_books

    def check_borrowing_records(self):
        borrowing_records = []
        for book in self.books:
            if not book.available:
                borrowing_records.append(f"Borrowed '{book.title}' by {book.author}")
        return borrowing_records


# 创建图书
book1 = Book("Book 1", "Author 1", True)
book2 = Book("Book 2", "Author 2", False)
book3 = Book("Book 3", "Author 3", True)

# 创建图书馆，并将图书添加到图书馆中
library = Library([book1, book2, book3])

# 检查可用的图书
available_books = library.check_available_books()
print("Available books:")
for book in available_books:
    print(f"- {book.title} by {book.author}")

# 检查已借阅的图书
borrowed_books = library.check_borrowed_books()
print("\nBorrowed books:")
for book in borrowed_books:
    print(f"- {book.title} by {book.author}")

# 检查借阅记录
borrowing_records = library.check_borrowing_records()
print("\nBorrowing records:")
for record in borrowing_records:
    print(record)

这个示例代码包括了三个类：Book、Library和一个主程序。Book类用于表示图书，包括标题、作者和是否可借阅的属性。Library类用于表示图书馆，包括一个图书列表和三个方法用于检查可用的图书、已借阅的图书和借阅记录。主程序创建了几本图书，并将它们添加到图书馆中，然后调用图书馆的三个方法来检查图书馆的状态。