In Week 5 you saved PNG charts with matplotlib. A PNG is a picture: a NorthPeak technician who sees a spike in December cannot zoom on it. Plotly draws the chart in the browser, where the user can zoom and hover, and one line puts it in your Streamlit page. This lesson covers plotly.express, the Figure object, date parsing, and the problem of two signals on one axis.
In Week 5 you saved PNG files with matplotlib. A PNG is a picture. A technician who sees a spike in December cannot zoom on it. Plotly draws the chart in the browser. Moving the mouse shows the exact date and value. Dragging a box zooms in. Double-clicking zooms out. Nothing to code: the chart does it.
Preview — the rest of the lesson is for enrolled readers.
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