7.6: Chapter Summary

Highlights from this chapter include:

• Programs can be organized into multiple .py files (modules). The import keyword allows a program to use functions defined in another .py file.
• The from keyword can be used to import specific functions from a module. However, programs should avoid importing (or defining) multiple functions with the same name.
• Modules often include the line if __name__ == "__main__" to prevent code from running as a side effect when the module is imported by other programs.
• When working in a shell, the help() function can be used to look up the documentation for a module. The documentation is generated from the docstrings.
• Python comes with over 200 built-in modules and hundreds of thousands of third-party modules. Programmers can search for modules on docs.python.org and pypi.org.

Statement	Description
import module	Imports a module for use in another program.
from module import function	Imports a specific function from a module.
if __name__ == "__main__":	A line of code found at the end of many modules. This statement indicates what code to run if the module is executed as a program (in other words, what code not to run if this module is imported by another program).
help(module_name)	Shows the documentation for the given module. The documentation includes the module's docstring, followed by a list of functions defined in the module, followed by a list of global variables assigned in the module, followed by the module's file name.
help(function_name)	Shows the docstring for the given function.
date(2023, 2, 14)	Creates a date object representing February 14, 2023. Requires: from datetime import date.

Table 7.3 Chapter 7 reference.