Using async/await in JavaScript in Selenium#

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from selenium import webdriver
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chromedriver_path = "/Users/simon/bin/chromedriver"
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driver = webdriver.Chrome(executable_path=chromedriver_path)
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script = """
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done = arguments[arguments.length-1];
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a1 = async () => {
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    return 42
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};
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a2 = async() => {
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    return await a1()+1
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};
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a2().then(done);
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"""
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output = driver.execute_async_script(script)
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# output is now the Python integer 43