[Python] How can I find the average of every next 4 values in a single column (Dataframe) and...

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This is the data where I need to find the average prices of Germany/luxemborg for every 4 hours as they are given in every hour and store it into a dataframe. I am having a lot of troubles in this because even after averaging it the new column would have less indexes than the original (8760) prbably something around 2200. Please help me

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