why is this failing?

[Erik Max Francis]

Chris Curvey wrote:

> I've looked at this so long that I must be looking right past it. 
> This
> code:
> 
> class Page:
>      ##########################################################
>      def write(self, value, row=None, col=None, len=None):
                                                  ^^^
>          print isinstance(value, str)
> 
>          # error occurs on this line
>          print len(value)

You are overriding the name len, so this is equivalent to writing

	None(value)

which is obviously an error.

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