Question

说实话，我什至不知道怎么称呼这个错误。

def create_vimeo_objects_details_DTO_thumbnail(number=5): 
    max_widths = []
    test_thumbnail = []
    for i in range(number):
        new_width = randint(0,2540)
        max_widths.append(new_width)
        dto_thumbnail = {
            'Thumbnail' : {
                'link' : '',
                'width' : new_width
            }
        }
        test_thumbnail = test_thumbnail + [VimeoObjectDetailsDTO(dto_thumbnail).Thumbnail]
    print('test thumbnail: ', [a.width for a in test_thumbnail])

dto_thumbnail是该类的一部分，必须从请求（字典）中启动

class VimeoObjectDetailsDTO:

    files = []
    pictures = None
    duration = None

    class FileDto:
        width = None
        height = None
        link = ''
        quality = ''

    class Pictures:
        sizes = []

    class Thumbnail:
        width = None
        link = ''

    def __init__(self, response):
        if 'files' in response: self.files = response['files']
        if 'pictures' in response: self.pictures = response['pictures']
        if 'duration' in response: self.duration = response['duration']
        if 'FileDto' in response:
            if 'width' in response['FileDto']: self.FileDto.width = response['FileDto']['width']
            if 'link' in response['FileDto']: self.FileDto.link = response['FileDto']['link']
            if 'height' in response['FileDto']: self.FileDto.height = response['FileDto']['height']
            if 'quality' in response['FileDto']: self.FileDto.quality = response['FileDto']['quality']
        if 'Pictures' in response:
            if 'sizes' in response['Pictures']: self.Pictures.sizes = response['Pictures']['sizes']
        if 'Thumbnail' in response:
            if 'width' in response['Thumbnail']: self.Thumbnail.width = response['Thumbnail']['width']
            if 'link' in response['Thumbnail']: self.Thumbnail.link = response['Thumbnail']['link']

执行此功能时，例如：

test thumbnail:  [1893, 1893, 1893, 1893, 1893]

但是当我打印max_widths时，我得到了正确的-不同的数字

如何使该函数返回/正确打印VimeoObjectDetailsDTO.Thumbnails？（我是否使用“ +”或附加都没关系）

Answer 1

您只有一个Thumbnail对象，它是类的所有实例共有的对象，因为它是一个类属性。因此，每当突变self.Thumbnail时，您都对同一个对象进行操作。

内部类的合法用途并不多，这当然不是合理的。此外，这些类没有任何方法，它们可能是字典，甚至根本不存在，例如Pictures。

无论如何，无论您做什么，都希望拥有实例属性而不是类属性，因此应在__init__中创建它们。

Python类会覆盖之前的初始化，而不是进行新的初始化

1 个答案: