def __init__(self, filename):
self.filename = filename<EOL>self.meta = VCFMeta()<EOL>self.n_individuals = <NUM_LIT:0><EOL>self.individuals = OrderedDict() <EOL>self.entries = {}<EOL>
VCF File container

        This class is designed to be somewhat consistent with the C++
        implementation of vcftools. It contains our higher level
        information such as metadata, samples, the format field,
        and can contain entries as well. Thus it can serve as a
        simple iterator or an in-memory VCF instance for rapid queries.