Python "is not None" 返回 None

Question

我正在遍历一个 JSON 对象，该对象的某些值为 null。我试图将这些值存储在另一个对象中，并将 null 替换为空字符串。然而，似乎 "is not None" 正在返回 "None"。 resource[key] 应该是字符串或空字符串，但它正在打印 "None"

def sanitize_resource(self, *args):
    resource = {}
    for key, value in args[0].iteritems():
        resource[key] = str(value) if value is not None else ''
        print resource[key]
    return resource

参数示例[0]

{"Resource Name":"Alexander","Contact Name":null,"Contact Email":null,"Primary Phone":"(828) 632","Primary Phone Ext":null,"Alternate Phone":null,"Alternate Phone Ext":null,"TTY":null,"Website URL":"http://url.org/locations/alexander/","Website Tiny URL":null,"Website Name":null,"Email":"live@url.org","Street Address":"260 Road","Street Address 2":null,"City":"Taylor","State":"FC","Postal Code":12345,"Description":null,"Category":null,"Tags":null,"Notes":null,"Services":null,"Longitude":null,"Latitude":null,"Thumbnail":null}

Answer 1

您没有 None 对象。你有 string "None".

您可以使用 repr() 而不是直接打印对象来检测差异：

print repr(value)

将打印带有引号的字符串。

演示：

>>> value = None
>>> print repr(value)
None
>>> str(value) if value is not None else ''
''
>>> value = "None"
>>> print repr(value)
'None'
>>> str(value) if value is not None else ''
'None'

Python "is not None" 返回 None

Python "is not None" returning None

python

iteration

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