plot data from Excel sheet by Matplotlib, how?

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Hi all,

Can any1 please guide me how to plot data from Excel by Matplotlib?
Let's say, I have 78(rows) x 8(cols) data in an Excel sheet. I would
like to plot data for all 78(rows) at 4th column against data for all
78(rows) at 7th column. How to plot it? Thank u!