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Data is the key to developing investing tools in Python. Lucky for us a company called AlphaAdvantage provides a free API which we can use in your Python development. You can test your programs on the MSFT ticker without a key but if you want to test other tickers you'll need a key.import pandas as pdimport sysapi_key = 'demo'ticker = sys.argv[1] api_url_daily = 'https://www.alphavantage.co/