Book Image

Learn Python in 7 Days

Book Image

Learn Python in 7 Days

Overview of this book

Python is a great language to get started in the world of programming and application development. This book will help you to take your skills to the next level having a good knowledge of the fundamentals of Python. We begin with the absolute foundation, covering the basic syntax, type variables and operators. We'll then move on to concepts like statements, arrays, operators, string processing and I/O handling. You’ll be able to learn how to operate tuples and understand the functions and methods of lists. We’ll help you develop a deep understanding of list and tuples and learn python dictionary. As you progress through the book, you’ll learn about function parameters and how to use control statements with the loop. You’ll further learn how to create modules and packages, storing of data as well as handling errors. We later dive into advanced level concepts such as Python collections and how to use class, methods, objects in python. By the end of this book, you will be able to take your skills to the next level having a good knowledge of the fundamentals of Python.
Table of Contents (18 chapters)
Title Page
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
2
Type Variables and Operators

Locating Python modules


After encountering the import statement, the Python interpreter searches the module in the following sequence:

  1. The current directory, which contains the running script. I advise you, be sure, that the name of your program is different from the importing modules.
  2. PYTHONPATH has to be defined in the environment variable in Windows OS. Let's learn by example. Consider we move the mod5.py program to another directory as covered in the following screenshot.

But the current directory does not contain any module1 module. The output will be as shown here:

Output of mod5.py  in a different directory 

We are running the mod5.py program from F:project_7daysmodulepack. The output shown there is no module1 module found. Let's set the PYTHONPATH variable as shown here:

Setting the PYTHONPATH variable

After setting PYTHONPATH, you will have to reboot your computer. After reboot, start the program again.

The output will be as shown here:

This is the output of the program after setting PYTHONPATH...