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    Using Python Functionality in Flow Scripts

    You can use almost all standard Python functionality in flow scripts by importing the standard Python module of your choice. There are several third-party modules available. See available third-party Python modules for more information. On this page we will give you some examples of common usage patterns.

    Available Third-Party Python Modules

    The following third-party Python modules are available to be used in your flow scripts:

    • arrow
    • holidays
    • html5lib
    • lxml
    • markdown
    • passlib
    • pdftotext
    • phonenumbers
    • pycryptodome
    • pyjwt
    • pyquery
    • pystache
    • python-dateutil
    • pytz
    • pyyaml
    • ujson

    Contact us at to request additional Python modules.


    Parse a PDF File

    You can access the content of PDF files directly in your flow script.

    Access a date written in a PDF file
    import re
    import base64
    import io
    import pdftotext
    import flow_api
    def handler(system: flow_api.System, this: flow_api.Execution):
    pdf_name = 'example.pdf'
    # Open the Cloudomation file object
    pdf_file = system.file(pdf_name)
    # Per default Cloudomation tries to parse files using UTF-8 and returns a Python string.
    # Here we want to access the binary content of the file,
    # so we need to set `convert_binary` to `False`
    file_base64 = pdf_file.get('content', convert_binary=False)
    file_bytes = base64.b64decode(file_base64)
    # Construct a `PDF` object from the bytes
    pdf = pdftotext.PDF(io.BytesIO(file_bytes))
    # Access the text of the first page of the PDF file
    pdf_text = pdf[0]
    # Clear the PDF object, so that the file object is closed
    pdf = None
    # Use a Regex to find the date
    the_date ='Date:\s*(\d{4}-[01]\d-[0-3]\d)', pdf_text).group(1)
    return this.success('all done')

    Work with CSV Files

    You can use the csv module to read CSV files into Python objects or write Python objects into CSV files.

    Create a CSV file and send it by email.
    import base64
    import csv
    import io
    import flow_api
    def handler(system: flow_api.System, this: flow_api.Execution):
    fake_data_list = [
    {'name': 'spam', 'number': 1},
    {'name': 'eggs', 'number': 2},
    {'name': 'foo', 'number': 3},
    {'name': 'bar', 'number': 4},
    result_file = io.StringIO()
    csv_writer = csv.DictWriter(
    fieldnames=['name', 'number'],
    for data in fake_data_list:
    csv_content = result_file.getvalue()
    result_file = None
    csv_writer = None
    'from': '',
    'to': '',
    'subject': 'Result',
    'text': 'See the attached file',
    'login': '',
    'password': '****',
    'smtp_host': '',
    'smtp_port': 587,
    'use_tls': True,
    'attachments': [
    return this.success('all done')
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