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)
2
Part I: Getting to Know Python
10
PART II: Algorithms and Circuits
14
PART III: Advanced Features and Libraries
19
References
20
Other Books You May Enjoy
Appendices
Appendix C: The Complete UniPoly Class
Appendix D: The Complete Guitar Class Hierarchy
Appendix F: Production Notes

8.2 Moving around the file system

If you have used a command line in Windows, macOS, or Linux, you know about the idea of the “current working directory” and how to move to another directory. Python has the same concept and functionality.

Figure 8.3 is another partial view of the directory tree for the files that make up this book.

A directory tree showing the current directory
Figure 8.3: A directory tree showing the current directory

If I am in the src directory, I can issue pwd on the operating system command line and see something like

Path
----
C:\src

on Windows, or

/src

on macOS or Linux. “pwd” is an abbreviation for “print working directory.” The corresponding Python function is getcwd, which is short for “get the current working directory,”

import os

os.getcwd()
'C:\\src'

I issue cd code on the command...