Book Image

Python Data Analysis - Second Edition

By : Ivan Idris
Book Image

Python Data Analysis - Second Edition

By: Ivan Idris

Overview of this book

Data analysis techniques generate useful insights from small and large volumes of data. Python, with its strong set of libraries, has become a popular platform to conduct various data analysis and predictive modeling tasks. With this book, you will learn how to process and manipulate data with Python for complex analysis and modeling. We learn data manipulations such as aggregating, concatenating, appending, cleaning, and handling missing values, with NumPy and Pandas. The book covers how to store and retrieve data from various data sources such as SQL and NoSQL, CSV fies, and HDF5. We learn how to visualize data using visualization libraries, along with advanced topics such as signal processing, time series, textual data analysis, machine learning, and social media analysis. The book covers a plethora of Python modules, such as matplotlib, statsmodels, scikit-learn, and NLTK. It also covers using Python with external environments such as R, Fortran, C/C++, and Boost libraries.
Table of Contents (22 chapters)
Python Data Analysis - Second Edition
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface
Key Concepts
Online Resources

Dataset - databases for lazy people


Dataset is a Python library which is basically a wrapper around SQLAlchemy. It claims to be so easy to use that even lazy people like it.

Install dataset as follows:

$ pip3 install dataset

Create a SQLite in-memory database and connect to it:

import dataset 
db = dataset.connect('sqlite:///:memory:') 

Create a table called books:

table = db["books"] 

Actually, the table in the database isn't created yet, since we haven't specified any columns. We only created a related object. The table schema is created automatically from calls to the insert() method. Give the insert() method dictionaries with book titles:

table.insert(dict(, author='Ivan Idris')) 
table.insert(dict(,  
author='Ivan Idris')) 
table.insert(dict(,  
author='Ivan Idris')) 

Print the rows from the table as follows:

for row in db['books']: 
   print(row) 

The following will be printed:

<dataset.persistence.util.ResultIter object at 0x10d4bf550>  
OrderedDict([('id', 1), ('title', "NumPy Beginner...