Book Image

Python Data Analysis - Third Edition

By : Avinash Navlani, Ivan Idris
5 (1)
Book Image

Python Data Analysis - Third Edition

5 (1)
By: Avinash Navlani, Ivan Idris

Overview of this book

Data analysis enables you to generate value from small and big data by discovering new patterns and trends, and Python is one of the most popular tools for analyzing a wide variety of data. With this book, you’ll get up and running using Python for data analysis by exploring the different phases and methodologies used in data analysis and learning how to use modern libraries from the Python ecosystem to create efficient data pipelines. Starting with the essential statistical and data analysis fundamentals using Python, you’ll perform complex data analysis and modeling, data manipulation, data cleaning, and data visualization using easy-to-follow examples. You’ll then understand how to conduct time series analysis and signal processing using ARMA models. As you advance, you’ll get to grips with smart processing and data analytics using machine learning algorithms such as regression, classification, Principal Component Analysis (PCA), and clustering. In the concluding chapters, you’ll work on real-world examples to analyze textual and image data using natural language processing (NLP) and image analytics techniques, respectively. Finally, the book will demonstrate parallel computing using Dask. By the end of this data analysis book, you’ll be equipped with the skills you need to prepare data for analysis and create meaningful data visualizations for forecasting values from data.
Table of Contents (20 chapters)
Section 1: Foundation for Data Analysis
Section 2: Exploratory Data Analysis and Data Cleaning
Section 3: Deep Dive into Machine Learning
Section 4: NLP, Image Analytics, and Parallel Computing

Reading and writing data from Excel

Excel files are widely used files in the business domain. Excel files can be easily read in Python's pandas using the read_excel() function. The read_excel() function takes a file path and sheet_name parameters to read the data:

# Read excel file

# display initial 5 records

This results in the following output:

DataFrame objects can be written on Excel sheets. We can use the to_excel() function to export DataFrame objects into an Excel sheet. Mostly, the to_excel() function arguments are the same as to_csv() except for the sheet_name argument:


In the preceding code example, we have exported a single DataFrame into an Excel sheet. We can also export multiple DataFrames in a single file with different sheet names. We can also write more than one DataFrame in a single Excel file (each DataFrame on different sheets...