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

6.5 Keyword arguments

Let’s define a function that encapsulates pow from math:

import math

def raiser(base, exponent):
    return math.pow(base, exponent)

I can call raiser using positional arguments, where Python assigns the first argument to base and the second to exponent.

raiser(2, 3)

I can also explicitly use the names of the parameters in keyword arguments.

raiser(base=2, exponent=3)

By itself, that’s not very exciting, but it is clearer what the arguments are providing to the function. You can use keyword arguments in any order.

raiser(exponent=3, base=2)

Positional arguments must come before keyword arguments. This works:

raiser(2, exponent=3)

but this does not:

raiser(base=2, 3)
SyntaxError: positional argument follows keyword argument

If you want to force users of your code to pass keyword arguments...