Named colors and hex codes in Matplotlib - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What color will this plot line be?

Look at the code below. What color will the line be when plotted using matplotlib?

Matplotlib

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

A A dark blue line

B A bright red line

C A black line

D A green line

💡 Hint

Named colors like 'navy' correspond to specific hex codes representing colors.

The named color 'navy' corresponds to a dark blue shade in matplotlib.

❓ data_output

intermediate

What hex code does this named color represent?

Given the named color 'tomato' in matplotlib, what is its hex code?

Matplotlib

import matplotlib.colors as mcolors
hex_code = mcolors.CSS4_COLORS['tomato']
print(hex_code)

A #ffa500

B #ff4500

C #ff0000

D #ff6347

💡 Hint

Check the CSS4_COLORS dictionary for the exact hex code.

The named color 'tomato' corresponds to the hex code '#ff6347' in matplotlib's CSS4_COLORS.

❓ visualization

advanced

Identify the color shown by this hex code

This code plots a line with color '#8A2BE2'. What named color does this hex code represent?

Matplotlib

import matplotlib.pyplot as plt
plt.plot([1, 2, 3], [3, 2, 1], color='#8A2BE2')
plt.show()

A BlueViolet

B DarkViolet

C MediumPurple

D SlateBlue

💡 Hint

Look up the hex code '#8A2BE2' in matplotlib's named colors.

The hex code '#8A2BE2' corresponds to the named color 'BlueViolet' in matplotlib.

🧠 Conceptual

advanced

Why use named colors instead of hex codes?

Which of the following is the best reason to use named colors like 'crimson' instead of hex codes like '#DC143C' in matplotlib?

A Named colors always produce brighter colors than hex codes.

B Named colors are easier to remember and understand than hex codes.

C Hex codes are not supported in matplotlib.

D Named colors use less memory than hex codes.

💡 Hint

Think about readability and ease of use.

Named colors are easier for humans to remember and understand compared to hex codes, which are less intuitive.

🔧 Debug

expert

What error does this code raise?

What error will this matplotlib code raise?

Matplotlib

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

A No error, plots with default color

B SyntaxError: invalid hexadecimal literal

C ValueError: Invalid RGBA argument

D TypeError: color must be a string

💡 Hint

Hex codes must contain valid hexadecimal digits (0-9, A-F).

The hex code '#GGHHII' contains invalid characters, causing matplotlib to raise a ValueError for invalid RGBA argument.