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Internally computers work in base 2. Many humans are used to base 10.

Programming languages and computer algebra systems take that into account.

Typically they accept input in base 10, work on it in base 2, and display results in base 10.

In some cases one wants to use other bases. There are various levels of support for that.

It's not common enough that plotting functions have dedicated flags, but they often offer ways to tweak the display.

In matplotlib and in Sage, see ticks, tick_labels, tick_formatter.