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def invoke_dot(input, out_file=None, file_type='svg', antialias=None):
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def invoke_dot(input, out_file=None, file_type='svg', antialias=None,
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cmdline = ['dot', '-T%s' % file_type, '-Nfontname=%s' % fontname,
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201
cmdline.extend(('-o', out_file))