https://www.datacamp.com/community/tutorials/matplotlib-tutorial-python#anatomy

University of Michigan - Ann Arbor

The pyplot module in the matplotlib package is useful for quickly creating a plot. The figures and axes that are a part of the plot are automatically created, without having to explicitly specify them. Using pyplot, we can utilize histograms, line, scatter, 3D, Contour, Polar, and Image plots. 

pyplot module

Matplotlib Tutorial

After importing the pyplot and numpy module: 
``` python
import matplotlib.pyplot as plt
import numpy as np
```
We can create a figure with a single axes, and then plot data onto the axes
```python
fig, ax = plt.subplots()
ax.plot([1,2,3,4],[4,3,2,1])
```
The plotting functions expect a numpy array or a numpy masked array as input

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