There are many tools for checking the structure of the code (basically, this is compliance with PEP-8) in Python, such as pycodestyle (formerly known as PEP-8), Flake8, and many more. They all are configurable and are as easy to use as running the command they provide. Among all of them, I have found Pylint to be the most complete (and strict). It is also configurable.

Again, you just have to install it in the virtual environment with pip:

$ pip install pylint

Then, just running the pylint command would be enough to check it in the code.

It is possible to configure Pylint via a configuration file named pylintrc.

In this file, you can decide the rules you would like to enable or disable, and parametrize others (for example, to change the maximum length of the column).