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Python Data Analysis

You're reading from   Python Data Analysis Perform data collection, data processing, wrangling, visualization, and model building using Python

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Product type Paperback
Published in Feb 2021
Publisher Packt
ISBN-13 9781789955248
Length 478 pages
Edition 3rd Edition
Languages
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Authors (2):
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 Navlani Navlani
Author Profile Icon Navlani
Navlani
Ivan Idris Ivan Idris
Author Profile Icon Ivan Idris
Ivan Idris
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Table of Contents (20) Chapters Close

Preface 1. Section 1: Foundation for Data Analysis
2. Getting Started with Python Libraries FREE CHAPTER 3. NumPy and pandas 4. Statistics 5. Linear Algebra 6. Section 2: Exploratory Data Analysis and Data Cleaning
7. Data Visualization 8. Retrieving, Processing, and Storing Data 9. Cleaning Messy Data 10. Signal Processing and Time Series 11. Section 3: Deep Dive into Machine Learning
12. Supervised Learning - Regression Analysis 13. Supervised Learning - Classification Techniques 14. Unsupervised Learning - PCA and Clustering 15. Section 4: NLP, Image Analytics, and Parallel Computing
16. Analyzing Textual Data 17. Analyzing Image Data 18. Parallel Computing Using Dask 19. Other Books You May Enjoy

Bar plot

A bar plot is a visual tool to compare the values of various groups. It can be drawn horizontally or vertically. We can create a bar graph using the bar() function:

# Add the essential library matplotlib
import matplotlib.pyplot as plt

# create the data
movie_ratings = [1,2,3,4,5]
rating_counts = [21,45,72,89,42]

# Plot the data
plt.bar(movie_ratings, rating_counts, color='blue')

# Add X Label on X-axis
plt.xlabel("Movie Ratings")

# Add X Label on X-axis
plt.ylabel("Rating Frequency")

# Add a title to graph
plt.title("Movie Rating Distribution")

# Show the plot
plt.show()

This results in the following output:

In the preceding bar chart program, the bar() function takes x-axis values, y-axis values, and a color. In our example, we are plotting movie ratings and their frequency. Movie ratings are on the x axis and the rating frequency is on the y axis. We can also specify the color of the bars in the bar graph using the color parameter. Let...

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