我有相當舊的系統 CentOS-7.4 和python包 requests-2.26.0。
import requests
...
try:
response = requests.post("http://localhost:8000", json={ '' })
except requests.exceptions.RequestException as e:
print e
except requests.exceptions.InvalidJSONError:
print "Invalid JSON Error."
...
由于json傳遞給post方法無效，我原以為例外會捕獲它，但是我得到了這個：
Traceback (most recent call last):
File "./cfg.py", line 219, in <module>
response = requests.post(URL, json={ '' })
File "/usr/lib/python2.7/site-packages/requests/api.py", line 117, in post
return request('post', url, data=data, json=json, **kwargs)
File "/usr/lib/python2.7/site-packages/requests/api.py", line 61, in request
return session.request(method=method, url=url, **kwargs)
File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 528, in request
prep = self.prepare_request(req)
File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 466, in prepare_request
hooks=merge_hooks(request.hooks, self.hooks),
File "/usr/lib/python2.7/site-packages/requests/models.py", line 319, in prepare
self.prepare_body(data, files, json)
File "/usr/lib/python2.7/site-packages/requests/models.py", line 471, in prepare_body
body = complexjson.dumps(json, allow_nan=False)
File "/usr/lib64/python2.7/json/__init__.py", line 250, in dumps
sort_keys=sort_keys, **kw).encode(obj)
File "/usr/lib64/python2.7/json/encoder.py", line 207, in encode
chunks = self.iterencode(o, _one_shot=True)
File "/usr/lib64/python2.7/json/encoder.py", line 270, in iterencode
return _iterencode(o, 0)
File "/usr/lib64/python2.7/json/encoder.py", line 184, in default
raise TypeError(repr(o) " is not JSON serializable")
TypeError: set(['']) is not JSON serializable
我究竟做錯了什么？
uj5u.com熱心網友回復：
請求使用simplejson或json庫來編碼 JSON 資料。任何引發的東西都會ValueError被捕獲并投射到InvalidJSONError，但TypeError不會被捕獲。見這里：
try: body = complexjson.dumps(json, allow_nan=False) except ValueError as ve: raise InvalidJSONError(ve, request=self)
您的測驗適用于以下任一示例：
a = {}
a["a"] = a
requests.get("http://url", json=a)
requests.get("http://url", json={"a": float("nan")})
最簡單的事情就是TypeError在except:
try:
response = requests.post("http://localhost:8000", json={''})
except requests.exceptions.RequestException as e:
print(e)
except (requests.exceptions.InvalidJSONError, TypeError):
print("Invalid JSON Error.")
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標籤：Python json python-2.7 例外 蟒蛇请求
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