Python 删除对象数组中的 JSON 属性
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Removing JSON property in array of objects
提问by Evan Emolo
I have a JSON array that I'm cleaning up in Python. I want to remove the imageDataproperty:
我有一个正在用 Python 清理的 JSON 数组。我想删除该imageData属性：
data.json
数据.json
[{"title": "foo", "imageData": "xyz123"},
{"title": "bar", "imageData": "abc123"},
{"title": "baz", "imageData": "def456"}]
I am setting up a list comprehension to remove the property, but I'm not sure how to create the variable that focuses on imageData:
我正在设置一个列表理解来删除该属性，但我不确定如何创建关注的变量imageData：
import json
with open('data.json') as json_data:
data = json.load(json_data)
clean_data = [ item for item in data if not item['imageData'] ]
# Write `clean_data` to new json file
When I printthe list comprehension, it returns an empty array. What do I have to correct to get this working properly?
当我print进行列表理解时，它返回一个空数组。我需要纠正什么才能使其正常工作？
采纳答案by Stefano Sanfilippo
An easy solution to your problem is deleting the unwanted key in place, with del:
解决问题的一个简单方法是删除不需要的密钥，使用del：
import json
with open('data.json') as json_data:
data = json.load(json_data)
for element in data:
del element['imageData']
You should add some safety checks, but you get the idea.
您应该添加一些安全检查，但您明白了。
回答by Evan Emolo
[ item for item in data if not item['imageData'] ]
is empty becaus allhave imageData. You are just testingfor it, not removingit.
为空，因为...一切都有imageData。您只是在测试它，而不是删除它。
Loop over dateand del item['imageData']on each item.
遍历date并del item['imageData']在每个item。
回答by Daniel Roseman
If not all the elements have an imageDatakey, then using delwill cause an KeyErrorexception. You could guard against that by using popwith a default:
如果不是所有的元素都有一个imageData键，那么使用del会导致KeyError异常。您可以通过使用pop默认值来防止这种情况：
for item in data:
item.pop('image', None)
回答by wwii
How about:clean_data = [k:v for k,v in data.iteritems() if k != 'imageData']
怎么样：clean_data = [k:v for k,v in data.iteritems() if k != 'imageData']
Or a dictionary expresion/comprehension if you want a dictionary:clean_data = {k:v for k,v in data.iteritems() if k != 'imageData'}
如果你想要一本字典，或者一个字典表达式/理解：clean_data = {k:v for k,v in data.iteritems() if k != 'imageData'}
