Adding pyflakes to code analysis and linter section

Created by: ethanchewy

What is this Python project?

From pyflakes readme.md: "A simple program which checks Python source files for errors.

Pyflakes analyzes programs and detects various errors. It works by parsing the source file, not importing it, so it is safe to use on modules with side effects. It's also much faster."

What's the difference between this Python project and similar ones?

Pyflakes is much faster than other linters since it doesn't complain about style. Rather, it focuses on only important issues.

As said in pyflakes documentation, "Pyflakes only examines the syntax tree of each file individually. As a consequence, Pyflakes is more limited in the types of things it can check."

Anyone who agrees with this pull request could vote for it by adding a 👍 to it, and usually, the maintainer will merge it when votes reach 20.

Pyflakes is much faster than other linters since it doesn't complain about style. Rather, it focuses on only important issues.