Book Image

Dancing with Python

By : Robert S. Sutor
Book Image

Dancing with Python

By: Robert S. Sutor

Overview of this book

Dancing with Python helps you learn Python and quantum computing in a practical way. It will help you explore how to work with numbers, strings, collections, iterators, and files. The book goes beyond functions and classes and teaches you to use Python and Qiskit to create gates and circuits for classical and quantum computing. Learn how quantum extends traditional techniques using the Grover Search Algorithm and the code that implements it. Dive into some advanced and widely used applications of Python and revisit strings with more sophisticated tools, such as regular expressions and basic natural language processing (NLP). The final chapters introduce you to data analysis, visualizations, and supervised and unsupervised machine learning. By the end of the book, you will be proficient in programming the latest and most powerful quantum computers, the Pythonic way.
Table of Contents (29 chapters)
Part I: Getting to Know Python
PART II: Algorithms and Circuits
PART III: Advanced Features and Libraries
Other Books You May Enjoy
Appendix C: The Complete UniPoly Class
Appendix D: The Complete Guitar Class Hierarchy
Appendix F: Production Notes

11.3 Oracles

An oracle determines whether some condition is true or not. We have seen these many times, for example, in the code if x < y. When we use in to test list membership, we are using an oracle. We also use an oracle to answer the question, “Is this item in that collection?”.

In practice, the code using the oracle doesn’t necessarily have to return True or False. If I am searching for an integer in a list of positive numbers, the code might negate the integer’s sign if it is a match. If it is not the value I am seeking, it leaves the sign alone.

In section 11.1, I focused on how many “==” comparisons we made in each version of the find_number function. Put another way, “how many times do I need to call the ‘==’ oracle? ”.

In the Grover search algorithm, the oracle is tuned to do something special for the item we ...