Track Amazon best-seller rank changes over time with Python

<p>Amazon's Best Sellers lists are a public signal, updated through the day, of what is selling in each category. One snapshot tells you what is popular. A series of snapshots tells you what is <em>changing</em>: which products are climbing, which just entered the top 100, which dropped out, and whose price moved before they did.</p> <p>Amazon doesn't keep that history for you. This post shows how

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