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Learning pandas

You're reading from   Learning pandas High performance data manipulation and analysis using Python

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Product type Paperback
Published in Jun 2017
Publisher
ISBN-13 9781787123137
Length 446 pages
Edition 2nd Edition
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Author (1):
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Michael Heydt Michael Heydt
Author Profile Icon Michael Heydt
Michael Heydt
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Table of Contents (16) Chapters Close

Preface 1. pandas and Data Analysis FREE CHAPTER 2. Up and Running with pandas 3. Representing Univariate Data with the Series 4. Representing Tabular and Multivariate Data with the DataFrame 5. Manipulating DataFrame Structure 6. Indexing Data 7. Categorical Data 8. Numerical and Statistical Methods 9. Accessing Data 10. Tidying Up Your Data 11. Combining, Relating, and Reshaping Data 12. Data Aggregation 13. Time-Series Modelling 14. Visualization 15. Historical Stock Price Analysis

Reading and writing from/to SQL databases

Pandas can read data from any SQL database that supports Python data adapters that respect the Python DB-API. Reading is performed using the pandas.io.sql.read_sql() function, and writing to SQL databases is done using the .to_sql() method of DataFrame.

To demonstrate, the following reads the stock data from msft.csv and aapl.csv. It then makes a connection to an SQLite3 database file. If the file does not exist, it is created on the fly. It then writes the MSFT data to a table named STOCK_DATA. If the table does not exist, it is created as well. If it does exist, all the data is replaced with the MSFT data. Finally, it then appends the AAPL stock data to that table:

To demonstrate that this data was created, you can open the database file with a tool such as SQLite Data Browser (available at https://github.com/sqlitebrowser/sqlitebrowser...

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