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我有一个使用 FLASK 和 ISBNLIB 库的简单应用程序，该应用程序获取条形码和 isbn 编号，搜索 ISBN 并将信息插入数据库。

isbnlib 元方法搜索 ISBN，然后将其插入我的 sqlite 数据库。

我遇到的问题是，当找不到那本书时，我收到一个错误：

isbnlib.dev._exceptions.NoDataForSelectorError

我想要实现的是让应用程序捕获此错误并仍然将我的条形码和 isbn 插入数据库并将空值输入其他字段。

我不确定如何解决这个问题。

任何建议将不胜感激。

这是代码：

else:
    # Assign meta dictionary to book_lib for value calling.
    book_lib = (isbnlib.meta(isbn, service='goob', cache='default'))

    # Display meta data to user.
    flash(isbnlib.meta(isbn, service='goob', cache='default'))

    # Assign meta dictionary values to variables for insertion to DB.
    author = str(book_lib['Authors'])
    lang = book_lib['Language']
    publisher = book_lib['Publisher']
    title = book_lib['Title']
    publYear = book_lib['Year']

    db.execute(
        'INSERT INTO new_book (barcode, isbn, invoice, author_id, author, lang, publisher, title, publYear)'
        ' VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)',
        (barcode, isbn, invoice, g.user['id'], author, lang, publisher, title, publYear)
    )
    db.commit()
    return redirect(url_for('book.newbook'))
4

2 回答 2

1

类似的东西应该适合你：

from isbnlib.dev._exceptions import NoDataForSelectorError


else:
    # Assign meta dictionary to book_lib for value calling.
    author = None
    lang = None
    publisher = None
    title = None
    publYear = None

    try:
        book_lib = isbnlib.meta(isbn, service='goob', cache='default')
        # Display meta data to user.
        flash(book_lib)

        # Assign meta dictionary values to variables for insertion to DB.
        author = str(book_lib['Authors'])
        lang = book_lib['Language']
        publisher = book_lib['Publisher']
        title = book_lib['Title']
        publYear = book_lib['Year']

    except NoDataForSelectorError:
        pass

    db.execute(
        'INSERT INTO new_book (barcode, isbn, invoice, author_id, author, lang, publisher, title, publYear)'
        ' VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)',
        (barcode, isbn, invoice, g.user['id'], author, lang, publisher, title, publYear)
    )
    db.commit()
    return redirect(url_for('book.newbook'))
于 2018-12-06T09:32:47.193 回答
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这有效（目前）但不建议使用，因为它使用不受支持的 api！

改用包罗万象的 isbnlib异常

from isbnlib import ISBNLibException

或具体的

from isbnlib.dev import NoDataForSelectorError

于 2019-01-13T14:15:21.333 回答