2
我想解決與Pandas remove null values when to_json類似的問題。json dumps TypeError:鍵必須是帶字典的字符串
我的解決辦法是
- 降
NaN
值轉換數據幀時,快譯通,然後 - 轉換字典使用
json.dumps()
這裏是我的代碼和錯誤JSON:
In [9]:df
Out[9]:
101 102
a 123 NaN
b 234 234
c NaN 456
In [10]:def to_dict_dropna(data):
return dict((k, v.dropna().to_dict()) for k, v in compat.iteritems(data))
In [47]:k2 = to_dict_dropna(df)
In [48]:k2
Out[48]:{101: {'a': 123.0, 'b': 234.0}, 102: {'b': 234.0, 'c': 456.0}}
In [49]:json.dumps(k2)
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-76-f0159cf5a097> in <module>()
----> 1 json.dumps(k2)
C:\Python27\lib\json\__init__.pyc in dumps(obj, skipkeys, ensure_ascii, check_circular, allow_nan, cls, indent, separators, encoding, default, sort_keys, **kw)
241 cls is None and indent is None and separators is None and
242 encoding == 'utf-8' and default is None and not sort_keys and not kw):
--> 243 return _default_encoder.encode(obj)
244 if cls is None:
245 cls = JSONEncoder
C:\Python27\lib\json\encoder.pyc in encode(self, o)
205 # exceptions aren't as detailed. The list call should be roughly
206 # equivalent to the PySequence_Fast that ''.join() would do.
--> 207 chunks = self.iterencode(o, _one_shot=True)
208 if not isinstance(chunks, (list, tuple)):
209 chunks = list(chunks)
C:\Python27\lib\json\encoder.pyc in iterencode(self, o, _one_shot)
268 self.key_separator, self.item_separator, self.sort_keys,
269 self.skipkeys, _one_shot)
--> 270 return _iterencode(o, 0)
271
272 def _make_iterencode(markers, _default, _encoder, _indent, _floatstr,
TypeError: keys must be a string
但它工作,如果我直接初始化ialize字典:
In [65]:k = {101: {'a': 123.0, 'b': 234.0}, 102: { 'b': 234.0, 'c': 456.0}}
In [66]:k == k2
Out[66]:True
In [63]:json.dumps(k)
Out[63]:'{"101": {"a": 123.0, "b": 234.0}, "102": {"c": 456.0, "b": 234.0}}'
我的代碼有什麼問題?
有趣的是,我曾預料這兩本詞典都會失敗。解決方法是使用'dict((str(k),v.dropna()。to_dict())for k,v in compat.iteritems(data))'(或'{str(k) :v.dropna()。to_dict())for k,v in compat.iteritems(data)}'使用dict理解符號)。 –
JSON C源代碼顯式測試'int','long','float'和'bool'鍵,將所有這些鍵轉換爲字符串。這意味着你的鍵不是真正的整數,而只是* mimic *整數(它們的表示是相同的,它們測試相等,但是'isinstance(int,key)'失敗)。 –