On Feb 2, 6:02 pm, Will <vocalster....@gmail.com> wrote:
> Thanks, it finally worked. Following your suggestion, what I did is:
>
> 1. in class body, define:
>      content = db.BlobProperty(required=False)            # notice required
> is set to False
>
> 2. in __init__(arg1, arg2, ...):
>      self.content = ''
>
> Then
>    self.content += src
>
> doesn't complain anymore.
>
> When accessing, it returns a db.Blog doesn't sound too foreign to me. For
> now, I just think it as a customized type caster in C++.
>
You can also use the 'default' parameter instead of initialising the
'content' value in the constructor:

content = db.BlobProperty(default='')

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