Formatting recommendations

The code in the following screenshot demonstrates almost all the PEP 8 formatting recommendations:

I'll now walk us through the recommendations one by one:

• PEP 8 recommends that a single line of code should not exceed a width of 79 characters

• Import statements should be placed at the top of the file, with standard library imports first, third-party imports next, and then imports from other modules within the same project
• There should be a blank line between each group of imports
• Classes and functions at the top level should have two blank lines separating them.
• Methods within a class should have one blank line separating them
• Within a function or method, blank lines should be used to indicate separation between conceptual groupings of code
• Don't insert extra spaces before or after parentheses, brackets, or braces; and don't insert spaces before commas or colons
• Always put a single space on either side of a binary operator, such as + or /
• Don't put more than one statement on the same line, which is occasionally possible, but never a good idea
• Comments should be written in human language, using that language's correct grammar

• Comments should also precede the section of code they described and be indented to the same level
• Every public module, class, function, or method should have a properly formatted docstring

Let's move on to picking names for variables, functions, methods, classes, modules, packages, and so on.