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Trouble within buying and selling all crossovers

Hello! I'm new to this community and Python in general. I'm wondering if any one can help with with figuring out the timing of buys and sells within a code.

Essentially, I'm looking to buy crossovers intraday. As an example, I would like to buy a stock whenever its RSI crosses above 70 and sell when it crosses under 30. I understand how to program the crosses, but have hit a wall with programming the algorithm to buy and sell for every cross everyday on the minutes-basis, instead of only working on the first cross of the day.

Can anyone help with this?