What is Matplotlib - Practice Questions & Exercises

Challenge - 5 Problems

🧠 Conceptual

intermediate

Purpose of Matplotlib in Data Science

What is the main purpose of Matplotlib in data science?

A To clean and preprocess raw data before analysis

B To perform statistical tests on data

C To store large datasets efficiently on disk

D To create visual representations like charts and graphs from data

💡 Hint

Think about how you can show data in pictures to understand it better.

Matplotlib is a library used to draw charts and graphs, helping us see patterns in data.

❓ Predict Output

intermediate

Output of Simple Matplotlib Code

What will this code display when run?

Matplotlib

import matplotlib.pyplot as plt
plt.plot([1, 2, 3], [4, 5, 6])
plt.show()

A No output, the code will raise an error

B A bar chart with bars at heights 1, 2, and 3

C A line graph connecting points (1,4), (2,5), and (3,6)

D A scatter plot with points at (4,1), (5,2), and (6,3)

💡 Hint

plt.plot draws lines between points given by x and y lists.

The plt.plot function draws a line graph connecting the points defined by the x and y lists.

❓ data_output

advanced

Data Points in a Matplotlib Scatter Plot

How many points will be shown in the scatter plot from this code?

Matplotlib

import matplotlib.pyplot as plt
x = [1, 2, 3, 4]
y = [10, 20, 25, 30]
plt.scatter(x, y)
plt.show()

A 4 points

B 3 points

C 1 point

D No points, code raises an error

💡 Hint

Each pair of x and y values creates one point.

The scatter plot shows one point for each pair of x and y values, so 4 points total.

❓ visualization

advanced

Effect of Changing Line Style in Matplotlib

What visual change happens if you add linestyle='--' to plt.plot?

Matplotlib

import matplotlib.pyplot as plt
plt.plot([1, 2, 3], [4, 5, 6], linestyle='--')
plt.show()

A The line becomes dashed instead of solid

B The line color changes to red

C The plot shows points without connecting lines

D The plot raises a syntax error

💡 Hint

linestyle controls how the line looks between points.

Setting linestyle='--' changes the line to a dashed style.

🔧 Debug

expert

Error Raised by Incorrect Matplotlib Import

What error will this code raise?

Matplotlib

import matplotlib
matplotlib.plot([1, 2, 3], [4, 5, 6])
matplotlib.show()

A SyntaxError: invalid syntax

B AttributeError: module 'matplotlib' has no attribute 'plot'

C TypeError: 'module' object is not callable

D No error, code runs and shows a plot

💡 Hint

matplotlib.pyplot is the submodule with plot and show functions.

The main matplotlib module does not have plot or show functions; they are in matplotlib.pyplot.