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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def build_and_pickle_dump(self, abivalidate=False):
 """ Build dirs and file of the `Flow` and save the object in pickle format. Returns 0 if success Args: abivalidate: If True, all the input files are validate by calling the abinit parser. If the validation fails, ValueError is raise. """

        self.build()
        if not abivalidate: return self.pickle_dump()

        # Validation with Abinit.
        isok, errors = self.abivalidate_inputs()
        if isok: return self.pickle_dump()
        errlines = []
        for i, e in enumerate(errors):
            errlines.append("[%d] %s" % (i, e))
        raise ValueError("\n".join(errlines))