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

6.11 Anonymous functions

In the last section, I defined four helper arithmetic functions and stored them in a dictionary. After that, I never needed their names again. Python provides lambda to let you create a function anonymously.

Instead of

def adder(x, y): return x + y
def subtracter(x, y): return x - y
def multiplier(x, y): return x * y
def divider(x, y): return x / y

operations = {
    "+": adder,
    "-": subtracter,
    "*": multiplier,
    "/": divider

do this:

operations = {
    "+": lambda x, y: x + y,
    "-": lambda x, y: x - y,
    "*": lambda x, y: x * y,
    "/": lambda x, y: x / y

operations["-"](12.4, 0.4)

A lambda function should contain one expression. Python evaluates the expression and returns the result. Don’t use return, and don’t put parentheses around the parameters.

If you plan to...