Make Line plot markers of different color

Question

I want to mark certain indices in the line plot. I have referred to the following question on stack overflow and written the following:

plt.plot(range(len(y)), y, '-bD', markevery=rare_cases, label='%s' % target_var_name)

However, this produces the following:

How can I keep the line plot in blue but make the markers in red ?

Answer 1

From the documentation of plt.plot:

matplotlib.pyplot.plot(*args, scalex=True, scaley=True, data=None, **kwargs)

The function takes **kwargs:

**kwargsLine2D properties, optional kwargs are used to specify properties like a line label (for auto legends), line-width, antialiasing, marker face color [...] Here is a list of available Line2D properties: [...]

markeredgecolor or mec color
markeredgewidth or mew float
markerfacecolor or mfc color
markerfacecoloralt or mfcalt color

So, you can feed markerfacecolor and markeredgecolor as keyword arguments:

x = np.random.randint(0,10,5)
y = np.random.randint(0,10,5)
    
plt.plot(x, y, '-bD',  c='blue', mfc='red', mec='k')