Creating a file (key) into Amazon S3 using Python (and boto) is not a problem.
With this code, I can connect to a bucket and create a key with a specific content:

```
bucket_instance = connection.get_bucket('bucketname')
key = bucket_instance.new_key('testfile.txt')
key.set_contents_from_string('Content for File')

```

I want to upload a file via the browser (file dialogue) into Amazon S3.

How can I realize this with boto?

Thanks in advance