检查是否存在嵌套属性

Question

我有一个嵌套OrderedDict,我想从中提取一个值.但在我提取该值之前,我必须确保存在一长串属性,并且它们的值不是无.

改进以下代码的最pythonic方法是什么:

if 'first' in data and \
    data['first'] and \
    'second' in data['first'] and \
    data['first']['second'] and \
    'third' in data['first']['second'] and \
    data['first']['second']['third']:
    x = data['first']['second']['third']

Answer 1

另一种get()方法是使用该方法:

x = data.get('first', {}).get('second', {}).get('third', None)

如果在任何时候钥匙不存在,那么 x = None