Hi! I have two problems that are related and that I'd like to solve together.
Firstly, I have code that allows either a file or a string representing its content as parameter. If the parameter is a file, the content is read from the file. In Python 2, I used "isinstance(p, file)" to determine whether the parameter p is a file. In Python 3, the returnvalue of open() is of type _io.TextIOWrapper, while the built-in class file doesn't exist, so I can't use that code.
Secondly, checking for the type is kind-of ugly, because it means that I can't use an object that fits but that doesn't have the right type. In other words, it breaks duck-typing. This is already broken in the Python 2 code, but since I have to touch the code anyway, I might as well fix it on the way.
If possible, I'm looking for a solution that works for Pythons 2 and 3, since I'm not fully through the conversion yet and have clients that might use the older snake for some time before shedding their skin.
Suggestions? Uli -- http://mail.python.org/mailman/listinfo/python-list
