How to use 'pdftotext python' in Python

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def pdftotext(filename: str) -> str:
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    """Convert a PDF file to a text equivalent.
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    Args:
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      filename: A string path, the filename to convert.
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    Returns:
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      A string, the text contents of the filename.
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    """
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    executable = ['pdftotext', '-layout', filename, '-']
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    pipe = Popen(executable, stdout=PIPE, stderr=PIPE)
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    stdout, stderr = pipe.communicate()
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    if stderr:
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        raise ValueError(stderr.decode('utf-8'))
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    else:
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        return stdout.decode()

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def writetextdoctopdf(text, **kwargs):
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    output = {}
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    try:
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        import reportlab
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    except ImportError:
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        output['message'] += "You do not have reportlab installed. You need to do that. "
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        output['status'] = 1
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        return output
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    from reportlab.pdfgen import canvas
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    from reportlab.lib.pagesizes import letter, landscape
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    from reportlab.lib.testutils import setOutDir,makeSuiteForClasses, outputfile, printLocation
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    from reportlab.platypus import Paragraph, SimpleDocTemplate, XBox, Indenter, XPreformatted
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    from reportlab.lib.styles import ParagraphStyle
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    from reportlab.lib.units import inch
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    from reportlab.lib.colors import red, black, navy, white, green
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    from reportlab.lib.randomtext import randomText
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    from reportlab.rl_config import defaultPageSize
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    styNormal = ParagraphStyle('normal')
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    styIndent1 = ParagraphStyle('normal', leftIndent=10)
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    body = []
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    for index,item in enumerate(text.split('\n')):
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        tabs = item.count('\t')
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        thisStyle = ParagraphStyle('normal', leftIndent=10*tabs)
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        body.append(Paragraph(item, thisStyle))
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    body.append(Paragraph("""\n\tThis has newlines and tabs on the front but inside the para tag""", styNormal))
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    doc = SimpleDocTemplate(kwargs['outputfile'])
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    # doc.build(body, onFirstPage=formatted_page, onLaterPages=formatted_page)
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    doc.build(body)
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    return output