Custom legend entries in Matplotlib - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the module needed for plotting.

Matplotlib

import [1] as plt

Drag options to blanks, or click blank then click option'

Aseaborn

Bmatplotlib.pyplot

Cnumpy

Dpandas

Attempts:

3 left

💡 Hint

Common Mistakes

Importing numpy or pandas instead of matplotlib.pyplot

Using seaborn which is a different plotting library

We import matplotlib.pyplot as plt to create plots and legends.

2fill in blank

medium

Complete the code to create a simple line plot with label 'Line 1'.

Matplotlib

plt.plot([1, 2, 3], [4, 5, 6], label=[1])
plt.legend()
plt.show()

Drag options to blanks, or click blank then click option'

Aline1

BLine 1

C'Line 1'

Dlabel

Attempts:

3 left

💡 Hint

Common Mistakes

Not using quotes around the label text

Using a variable name without defining it

The label must be a string, so it needs quotes around it.

3fill in blank

hard

Fix the error in the code to create a custom legend entry using Line2D.

Matplotlib

from matplotlib.lines import Line2D
custom_line = Line2D([0], [0], color='red', lw=4)
plt.legend(handles=[[1]])
plt.show()

Drag options to blanks, or click blank then click option'

Acustom_line

Bline

Ccustom_lines

Dhandle

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that was not defined

Using plural form when the variable is singular

The variable created is custom_line, so it must be used in the legend handles list.

4fill in blank

hard

Fill both blanks to create two custom legend entries with different colors and labels.

Matplotlib

from matplotlib.lines import Line2D
custom_lines = [Line2D([0], [0], color=[1], lw=4), Line2D([0], [0], color=[2], lw=4)]
plt.legend(custom_lines, ['Blue line', 'Green line'])
plt.show()

Drag options to blanks, or click blank then click option'

A'blue'

B'red'

C'green'

D'yellow'

Attempts:

3 left

💡 Hint

Common Mistakes

Using colors without quotes

Mixing up the order of colors and labels

The first custom line is blue and the second is green, so use 'blue' and 'green' strings.

5fill in blank

hard

Fill all three blanks to create a custom legend with shapes and labels.

Matplotlib

from matplotlib.lines import Line2D
custom_lines = [Line2D([0], [0], color='black', marker=[1], linestyle='None', markersize=10),
                Line2D([0], [0], color='black', marker=[2], linestyle='None', markersize=10),
                Line2D([0], [0], color='black', marker=[3], linestyle='None', markersize=10)]
plt.legend(custom_lines, ['Circle', 'Square', 'Triangle'])
plt.show()

Drag options to blanks, or click blank then click option'

A'o'

B's'

C'^'

D'x'

Attempts:

3 left

💡 Hint

Common Mistakes

Using marker characters that do not match the shape labels

Forgetting quotes around marker characters

The markers 'o', 's', and '^' represent circle, square, and triangle shapes respectively.