Python is an interpreted high-level language that was originally developed by Guido van Rossum in 1991. The Python community is special in the sense that it pays close attention to how the code is written. For that, since the early days of Python, the Python community has created and maintained a particular flavor in its design philosophy. Today, Python is used in a wide variety of industries, ranging from education to medicine. But regardless of the industry in which it is used, the particular culture of the vibrant Python community is usually seen to be part and parcel of Python projects.
In particular, the Python community wants us to write simple code and avoid complexity wherever possible. In fact, there is an adjective, Pythonic, which means there are multiple ways to accomplish a certain task but there is a preferred way as per the Python community conventions and as per the founding philosophy of the language. Python nerds try their best to create artifacts that are as Pythonic as possible. Obviously, unpythonic code means that we are not good coders in the eyes of these nerds. In this book, we will try to go as Pythonic as possible as we can in our code and design.
And there is something official about being Pythonic as well. Tim Peters has concisely written the philosophy of Python in a short document, The Zen of Python. We know that Python is said to be one of the easiest languages to read, and The Zen of Python wants to keep it that way. It expects Python to be explicit through good documentation and as clean and clear as possible. We can read The Zen of Python ourselves, as explained next.
In order to read The Zen of Python, open up a Python console and run the import this command, as shown in the following screenshot:
Figure 1.1 – The Zen of Python
The Zen of Python seems to be a cryptic text discovered in an old Egyptian tomb. Although it is deliberately written in this casual cryptic way, there is a deeper meaning to each line of text. Actually, look closer—it can be used as a guideline to code in Python. We will refer to different lines from The Zen of Python throughout the book. Let's first look into some excerpts from it, as follows:
- Beautiful is better than ugly: It is important to write code that is well-written, readable, and self-explanatory. Not only should it work—it should be beautifully written. While coding, we should avoid using shortcuts in favor of a style that is self-explanatory.
- Simple is better than complex: We should not unnecessarily complicate things. Whenever facing a choice, we should prefer the simpler solution. Nerdy, unnecessary, and complicated ways of writing code are discouraged. Even when it adds some more lines to the source code, simpler remains better than the complex alternative.
- There should be one-- and preferably only one --obvious way to do it: In broader terms, for a given problem there should be one possible best solution. We should strive to discover this. As we iterate through the design to improve it, regardless of our approach, our solution is expected to evolve and converge toward that preferable solution.
- Now is better than never: Instead of waiting for perfection, let's start solving the given problem using the information, assumptions, skills, tools, and infrastructure we have. Through the process of iteration, we will keep improving the solution. Let's keep things moving instead of idling. Do not slack while waiting for the perfect time. Chances are that the perfect time will never come.
- Explicit is better than implicit: The code should be as self-explanatory as possible. This should be reflected in the choice of variable names, the class, and the function design, as well as in the overall end-to-end (E2E) architecture. It is better to err on the side of caution. Always make it more explicit whenever facing a choice.
- Flat is better than nested: A nested structure is concise but also creates confusion. Prefer a flat structure wherever possible.
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