plot() format string

Use a format string (here, 'ro') to set the color and markers of a plot.

import matplotlib.pyplot as plt
plt.plot([1, 2, 3, 4], [1, 4, 9, 16], 'ro')
plt.show()

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References

The use of the following functions, methods, classes and modules is shown in this example:

import matplotlib
matplotlib.pyplot.plot
matplotlib.axes.Axes.plot

Out:

<function Axes.plot at 0x7fba54b45550>