Python“不是None”返回None

Question

我正在遍歷一個JSON對象，該對象的某些值具有null。 我正在嘗試將這些值存儲在另一個對象中，並將null替換為空字符串。 但是，似乎“不是None”返回“ None”。 resource [key]應該是一個字符串，或者是一個空字符串，但是它的輸出是“ 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

args [0]的示例

{"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

您沒有None對象。 您有字符串 "None" 。

您可以通過使用repr()而不是直接打印出對象來檢測差異：

print repr(value)

字符串將帶有引號。

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'