Matplotlib: How to display a legend with custom colors for each grouped line in a multi-line plot?
I'm trying to debug I'm updating my dependencies and I'm trying to create a multi-line plot using Matplotlib where each line represents a different data group, and I want to customize the legend with specific colors that are different from the default colors assigned by Matplotlib. However, I'm running into an scenario where the legend colors do not match the line colors in the plot. I've tried defining custom colors for each line and manually creating the legend, but the colors still don't align as expected. Here's a simplified version of my code: ```python import matplotlib.pyplot as plt import numpy as np # Sample data x = np.linspace(0, 10, 100) y1 = np.sin(x) y2 = np.cos(x) y3 = np.tan(x) # Define custom colors custom_colors = ['red', 'blue', 'green'] # Plotting the lines plt.plot(x, y1, color=custom_colors[0], label='Sine') plt.plot(x, y2, color=custom_colors[1], label='Cosine') plt.plot(x, y3, color=custom_colors[2], label='Tangent') # Attempting to customize the legend plt.legend(loc='upper right') plt.title('Multi-line Plot with Custom Legend Colors') plt.xlabel('X-axis') plt.ylabel('Y-axis') plt.show() ``` When I run this code, the lines are plotted correctly with red, blue, and green colors, but the legend does not reflect these colors accurately. Instead, it shows default colors that do not match the lines. I've also tried using `plt.legend(handles=[...])` to explicitly define the legend handles along with custom colors, but the scenario continues. Can anyone guide to troubleshoot this or suggest a better way to ensure the legend colors match the line colors accurately? This issue appeared after updating to Python LTS. Any feedback is welcome! Could someone point me to the right documentation?