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I am using Trading View for the normal stuff but I also started my own framework/apps collection using data from alpaca.markets and are now approaching different data providers for direct raw data feeds as I am into order books lately and focus on Nasdaq Stocks and Futures.
I needed the same "next level" programmatic support, and found the existing platforms, tools and back-testers to all be lacking in one feature or another, so I bit the bullet and started hacking on my own* -- feel free to follow along as it gets built out: https://github.com/9600dev/mmr.
if you store the OHLC data in a relational database, use connector-x to load the data into pandas dataframe
Actually, the TradingView charting library is free https://www.tradingview.com/HTML5-stock-forex-bitcoin-charting-library/ couple that with your brokers API and a technical analysis library, and you can reproduce exactly what you see in TradingView