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|Sg}x�|r�tj|�}|s?|j|�Pn|jd�j�}|j||j��}|j�\}}|j|| �|j|�||}qWdj|�S(sPerform variable replacement

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    ConfigParser Include Pre-Processor

    File-like Object capable of pre-processing include= lines for
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    Suggested Usage::
        cfg = ConfigParser.ConfigParser()
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        Implementation of File-Like Object readline function. This should be
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        popped off the stack and the next FLO takes over. include= lines 
        found anywhere cause a new FLO to be opened and pushed onto the top 
        of the stack. Finally, we return EOF when the bottom-most (configfile
        arg to __init__) FLO returns EOF.
        
        Very Technical Pseudo Code::
        
            def confpp.readline() [this is called by ConfigParser]
                open configfile, push on stack
                while stack has some stuff on it
                    line = readline from file on top of stack
                    pop and continue if line is EOF
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                        continue
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                        return line
                
                return EOF
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        Returns an absolute url for the (possibly) relative
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        Opens the url specified, pushes it on the stack, and 
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        Checks if the tuple describes an include that was already done.
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