import matplotlib.pyplot as plt
years = [2021, 2022, 2023, 2024, 2025]
values = [12, 15, 14, 19, 23]
plt.plot(years, values, marker="o")
plt.title("Value by year")
plt.xlabel("Year")
plt.ylabel("Value")
plt.show()
11 Data Visualization
11.1 A basic line chart
11.2 A bar chart
cities = ["A", "B", "C"]
values = [20, 35, 28]
plt.bar(cities, values)
plt.title("Value by city")
plt.xlabel("City")
plt.ylabel("Value")
plt.show()
11.3 Things to remember
- A chart should answer a specific question.
- Label axes and units.
- Avoid unnecessary visual elements.
- Inspect the underlying data before plotting it.