Matplotlib figures, axes, and rendering backends

What you will learn

• Explain matplotlib figures in Matplotlib using the correct mental model
• Trace a focused Matplotlib example and predict its result before execution
• Recognize a boundary case involving axes and handle it deliberately

The concept

Matplotlib figures, axes, and rendering backends is a defining part of practical Matplotlib work. Start by identifying the data or state involved, then trace the operation that changes or interprets it. Pay attention to the rules Matplotlib applies at this boundary, because those rules explain both the useful behavior and the common failure modes. This lesson keeps the example deliberately small, then connects it to plot calls, artists, and explicit axes so the ideas form a coherent progression rather than a list of isolated syntax facts.

Example

This example is intentionally small so you can trace every line before adapting it.

import matplotlib.pyplot as plt
plt.plot([1, 2, 3], [2, 4, 3])
plt.show()

Read it step by step

1. 1
   Locate the idea

   Identify where matplotlib figures appears in the Matplotlib example and name the data it operates on.

2. 2
   Trace the rule

   Trace the relevant Matplotlib rule one operation at a time, recording any state, type, or control-flow change.

3. 3
   Test a boundary

   Change one input or boundary condition, predict the result, and compare that prediction with the documented outcome.

Common mistakes

Try it yourself