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1. ENVIRONMENT SE TUP

AND THE COMMAND LINE Environment setup is the process of organiz- ing your computer so you can write code. This involves installing any necessary tools, configuring them, and handling any hiccups during the setup. There is no single setup process because everyone has a different computer with a different operating system, version of the operating system, and version of the Python interpreter. Even so, this chapter describes some basic concepts to help you administer your own computer using the command line, environment variables, and filesystem.

Learning these concepts and tools might seem like a headache. You want to write code, not poke around configuration settings or understand inscrutable console commands. But these skills will save you time in the long run. Ignoring error messages or randomly changing configuration settings to get your system working well enough might hide problems, but it won’t fix them. By taking the time to understand these issues now, you can prevent them from reoccurring.

• 1.1. The Filesystem
• 1.2. Paths in Python
  • 1.2.1. The Home Directory
  • 1.2.2. The Current Working Directory
  • 1.2.3. Absolute vs. Relative Paths
• 1.3. Programs and Processes
• 1.4. The Command Line
  • 1.4.1. Opening a Terminal Window
  • 1.4.2. Running Programs from the Command Line
  • 1.4.3. Using Command Line Arguments
  • 1.4.4. Running Python Programs from the Command Line
• 1.5. Environment Variables and PATH
  • 1.5.1. Viewing Environment Variables
  • 1.5.2. Working with the PATH Environment Variable
  • 1.5.3. Permanently Adding Folders to PATH on Windows
• 1.6. Running Python Programs Without the Command Line
  • 1.6.1. Running Python Programs on Ubuntu Linux

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1.1. The Filesystem