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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

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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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            def confpp.readline() [this is called by ConfigParser]
                open configfile, push on stack
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                    line = readline from file on top of stack
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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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