我目前正在尝试从一些 JSON 中获取一个值,例如:
bitly_data = "https://api-ssl.bitly.com/v3/link/clicks?access_token=ACCESS_TOKEN&link=http://bit.ly/TCATL"
(读取时,此数据看起来像{"status_code": 200, "data": {"units": -1, "tz_offset": -4, "unit": "day", "link_clicks": 390}, "status_txt": "OK"}
)
然后我读取数据并尝试将整数值保存link_clicks
为变量clicks
:
src = urllib2.urlopen(bitly_data)
clicks = json.load(src)
clicks = clicks['data']['link_clicks']
print clicks
打印了正确的值clicks
(390),尽管我得到了一个 TypeError:'NoneType' object is not subscriptable
整个回溯如下:
Traceback (most recent call last):
File "/Library/Python/2.7/site-packages/Flask-0.9-py2.7.egg/flask/app.py", line 1701, in __call__
return self.wsgi_app(environ, start_response)
File "/Library/Python/2.7/site-packages/Flask-0.9-py2.7.egg/flask/app.py", line 1689, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "/Library/Python/2.7/site-packages/Flask-0.9-py2.7.egg/flask/app.py", line 1687, in wsgi_app
response = self.full_dispatch_request()
File "/Library/Python/2.7/site-packages/Flask-0.9-py2.7.egg/flask/app.py", line 1360, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/Library/Python/2.7/site-packages/Flask-0.9-py2.7.egg/flask/app.py", line 1358, in full_dispatch_request
rv = self.dispatch_request()
File "/Library/Python/2.7/site-packages/Flask-0.9-py2.7.egg/flask/app.py", line 1344, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/Users/Zach/Dropbox/bitly/bit.py", line 33, in settings
clicks = clicks['data']['link_clicks']
我很困惑为什么尽管有错误,但我返回了正确的值。我尝试重写有问题的行,clicks = clicks['data']['link_clicks'] or 0
但无济于事。我也试着把它变成一个if statement
like,
if clicks['data']['link_clicks'] == None:
clicks = 0
else:
clicks = clicks['data']['link_clicks']
但这又没有效果。
提前谢谢了。