使用python上载s3文件时出错

正在尝试将图像上载到amazon上的存储桶

图像通过表单上传，图像存储在“文件”中：

file = request.files['file']

我还尝试将其重命名为“filename”，它保存上传图像的用户的id

我的应用程序在Heroku上运行

代码如下：

        filename = str(userName.id)

        # S3_BUCKET, AWS_ACCESS_KEY & AWS_SECRET_KEY = HEROKU envar from config.py

        conn = boto.connect_s3(app.config['AWS_ACCESS_KEY'], app.config['AWS_SECRET_KEY'])
        bucket = conn.get_bucket(app.config['S3_BUCKET'])

        key = '%s.jpg' % filename
        k = Key(bucket)
        k.key = key
        k.set_contents_from_filename(file.filename)

当我尝试上载名为“8888888.jpg”的图像时，heroku日志中出现以下错误：

    2015-02-12T22:56:33.214246+00:00 heroku[router]: at=info method=POST path="/registering" host=monkey-me.herokuapp.com request_id=261d25bd-10bc-4703-aa38-badbcb4e634e fwd="213.243.186.53" dyno=web.1 connect=1ms service=809ms status=500 bytes=456
2015-02-12T22:56:33.181111+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request
2015-02-12T22:56:33.181113+00:00 app[web.1]:     rv = self.dispatch_request()
2015-02-12T22:56:33.181101+00:00 app[web.1]: Traceback (most recent call last):
2015-02-12T22:56:33.181105+00:00 app[web.1]:     response = self.full_dispatch_request()
2015-02-12T22:56:33.181082+00:00 app[web.1]: Exception on /registering [POST]
2015-02-12T22:56:33.181103+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app
2015-02-12T22:56:33.181106+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request
2015-02-12T22:56:33.181110+00:00 app[web.1]:     reraise(exc_type, exc_value, tb)
2015-02-12T22:56:33.181107+00:00 app[web.1]:     rv = self.handle_user_exception(e)
2015-02-12T22:56:33.181114+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/flask/app.py", line 1461, in dispatch_request
2015-02-12T22:56:33.181117+00:00 app[web.1]:   File "/app/app.py", line 361, in registering
2015-02-12T22:56:33.181121+00:00 app[web.1]:     with open(filename, 'rb') as fp:
2015-02-12T22:56:33.181119+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/boto/s3/key.py", line 1358, in set_contents_from_filename
2015-02-12T22:56:33.181116+00:00 app[web.1]:     return self.view_functions[rule.endpoint](**req.view_args)
2015-02-12T22:56:33.181109+00:00 app[web.1]:   File "/app/.heroku/python/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception
2015-02-12T22:56:33.181122+00:00 app[web.1]: IOError: [Errno 2] No such file or directory: u'888888.jpg'
2015-02-12T22:56:33.181118+00:00 app[web.1]:     k.set_contents_from_filename(file.filename)

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我做错了什么（这是我第一次使用S3）

我撤销了这个答案。这个网站有毒。

谢谢你的回答，伙计！