prograhams

• Libraries


  Bits of code written by you or others that you can use in your program
• Modules


  Python allows you to share functions or features with others
• If you copy and paste code from an old project, you can create a module or library to bring into your new project
• Random library


  A library that comes with Python that you could import into your own project
• It's easier as a coder to stand on the shoulders of prior coders
• Importing a module


  Use the word import in your program
• random.choice(seq)


  A function in the random module that takes a sequence (list) and randomly selects an item from it

  
• Sequence passed to random.choice()


  • List with square brackets, quotes, and commas
• Passing two items to random.choice()


  Python gives a 50% chance for each item
• Importing specific functions from a module


  Use the from keyword to explicitly import only the functions you need
• random.randint(a, b)


  A function in the random module that generates a random integer between a and b

  
• Statistics library


  A built-in Python library with useful statistical functions like mean()
• Accessing command-line arguments


  Use the sys module and sys.argv to get the arguments the user typed at the command line

  
• sys.argv[0] contains the name of the Python script

  
• Handling missing command-line arguments

  Use try-except blocks to catch and handle errors when the user doesn't provide the expected arguments
• Exiting the program on error


  Use sys.exit() to exit the program cleanly when an error is encountered
• Slice


  A way to take a subset of a list by specifying the start and end indices
• Python lists are zero-indexed, so the first element is at index 0
• Packages


  Third-party libraries implemented as a folder, that add functionality to Python
• PyPI is a repository of all available third-party Python packages
• Pip


  Python's package manager that allows you to install packages quickly
• APIs


  Application Programming Interfaces that allow your program to connect to and use the code of others
• The iTunes API provides a JSON-formatted data feed that you can access in your Python programs

  
• Creating your own library


  Write functions in a Python file that can be imported and used by other programs

  
• You can create your own libraries to reuse code or share with others