Bar Graphs with a Crime Data Analysis Project

Looking at crime data in a spreadsheet can get boring pretty quickly. A bar graph makes it much easier to compare countries and spot which ones have higher or lower crime rates. Instead of drowning in a sea of boring numbers, you get clean visuals that actually make sense. Simple to create, fun to read, and they make you look smart while analyzing serious data.

Why Use Bar Graphs?

Imagine scrolling through hundreds of numbers trying to find the biggest value. A bar graph does that work for you by turning those numbers into something visual. Whether it's crime stats, fav snacks, or top songs — bar graphs make boring numbers look clean and easy to digest.

What You'll Learn

• How to take boring numbers and turn them into bar graphs
• Visualize real-world crime data from multiple countries
• Plot and compare data from 2023 vs 2024 — side by side
• Learn how to make your graphs easier to read with labels, colors, and gridlines.
• Understand bar graph basics without any fluff — just pure logic

Step-by-Step Code Examples

Plotting a single year (2023)

import matplotlib.pyplot as plt
import numpy as np

countries = [
    "United States", "Brazil", "India", "Germany", "South Africa", "Australia",
    "Canada", "Russia", "Japan", "United Kingdom", "France", "Mexico"
]

crime_2023 = [6800, 7200, 4900, 3500, 7500, 4200, 3900, 5500, 2800, 4700, 4600, 6900]

plt.figure(figsize=(10, 5))
plt.bar(countries, crime_2023, label="2023", zorder=3, width=0.5, color="#376dc5")

plt.xticks(rotation=40, ha='right')
plt.title("Crime Rates Across Countries in 2023")
plt.xlabel("Countries")
plt.ylabel("Number of Crimes")
plt.grid(True, linestyle='--', alpha=0.5, zorder=0)
plt.legend()

plt.tight_layout()
plt.show()

Output:

• Imports: We bring in matplotlib.pyplot for plotting and numpy for advanced stuff later.
• Data Setup: Two lists — one for countries and another for crime stats in 2023.
• Chart Size: figsize=(10, 5) gives enough space so nothing looks cramped.
• Plotting Bars: plt.bar() draws the bars with a clean blue color and width=0.5 so they're not too chunky.
• Rotation Fix: plt.xticks(rotation=40) tilts the x-axis labels so they don't overlap.
• Labels & Title: plt.xlabel(), plt.ylabel(), and plt.title() give the chart context.
• Light Grid: plt.grid(True, alpha=0.5) adds subtle lines that help read values without being distracting.
• Layout Fix: plt.tight_layout() prevents text from getting cut off.

Plotting 2023 & 2024 side by side

import matplotlib.pyplot as plt
import numpy as np

countries = [
    "United States", "Brazil", "India", "Germany", "South Africa", "Australia",
    "Canada", "Russia", "Japan", "United Kingdom", "France", "Mexico"
]

crime_2023 = [6800, 7200, 4900, 3500, 7500, 4200, 3900, 5500, 2800, 4700, 4600, 6900]
crime_2024 = [6500, 7000, 4700, 3300, 7100, 4000, 3800, 5300, 2600, 4500, 4300, 6600]

plt.figure(figsize=(10, 6))

x = np.arange(len(countries))
width = 0.3

plt.bar(x - width / 2, crime_2023, width=width, label="2023", color="#262F58", zorder=3)
plt.bar(x + width / 2, crime_2024, width=width, label="2024", color="#247FC9", zorder=3)

plt.xticks(x, countries, rotation=45, ha='right')
plt.title('Crime Comparison (2023 vs 2024)')
plt.xlabel("Countries")
plt.ylabel("Number of Crimes")
plt.grid(True, linestyle='--', alpha=0.6, zorder=0)
plt.legend(loc="upper right")

plt.tight_layout()
plt.show()

Output:

• Year Comparison: We plot both crime_2023 and crime_2024 side by side so you can instantly spot changes per country.
• X-axis with np.arange(): Gives each country its own position on the x-axis — clean spacing, no overlap.
• Side-by-side bars: x - width / 2 handles 2023, x + width / 2 handles 2024 — instant visual comparison.
• Bar width: width = 0.3 keeps it tight and tidy — bars don't bump into each other.
• Color coding: Navy blue for 2023 (#262F58) and sky blue for 2024 (#247FC9) — easy to tell apart.
• Legend placement: loc="upper right" keeps it visible but out of the way.

Mini Project: Visualize Top Crime Cities

Let's build a real-world horizontal bar chart using an actual crime dataset — Indian cities with the highest number of reported crimes.

How to Use This Dataset

Not familiar with Pandas? No worries — here's a quick guide to get started.

• Step 1: Download the CSV file above.
• Step 2: Drag and drop it into your code editor (like VS Code).
• Step 3: Write the following code to import and read the data:

import pandas as pd

crime = pd.read_csv("crime_city_insights.csv")

That's it! Use the crime variable to explore the dataset. Try crime.head() to view the top rows or crime.describe() for basic stats.

Frequently Asked Questions

What is a bar graph in Python?

A bar graph is a chart that uses rectangular bars to compare values across categories. In Python, bar graphs are commonly created using Matplotlib's plt.bar() function.

When should I use a bar graph?

Use a bar graph when you want to compare quantities between different groups, such as countries, products, students, or cities.

What is the difference between a bar graph and a histogram?

A bar graph compares categories, while a histogram shows the distribution of numerical data.