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1. #THREE PRINCIPLES FROM ZEN OF PYTHON HOW TO#
2. #THREE PRINCIPLES FROM ZEN OF PYTHON CODE#
3. #THREE PRINCIPLES FROM ZEN OF PYTHON DOWNLOAD#

#THREE PRINCIPLES FROM ZEN OF PYTHON CODE#

The Single Responsibility Principle (SRP) is all about increasing cohesion and decreasing coupling by organizing code around responsibilities. Relevant Zen: There should be one- and preferably only one -obvious way to do things

#THREE PRINCIPLES FROM ZEN OF PYTHON DOWNLOAD#

download ( target )ĭefinition: Every module/class should only have one responsibility and therefore only one reason to change. upload ( file ) def download ( self, target : str, ** kwargs ) -> bytes : is_sftp = kwargs if is_sftp : with self. _sftp_client = SFTPDriver ( kwargs, kwargs, kwargs ) def upload ( self, file : bytes, ** kwargs ): is_sftp = kwargs if is_sftp : with self. _ftp_client = FTPDriver ( kwargs, kwargs ) self. Here is the code we are going to start with.Ĭlass FTPClient : def _init_ ( self, ** kwargs ): self. Instead of using a different code snippet for each principle, We are going to work with a single code base and make it more SOLID as we cover each principle. Namespaces are one honking great idea - let's do more of those!īefore I jump right into the principles and how they relate to the Zen of Python, there's one thing I want to do that no other SOLID tutorial does. If the implementation is easy to explain, it may be a good idea. If the implementation is hard to explain, it's a bad idea. There should be one- and preferably only one -obvious way to do it.Īlthough that way may not be obvious at first unless you're Dutch.Īlthough never is often better than right now. In the face of ambiguity, refuse the temptation to guess. Special cases aren't special enough to break the rules. I think the most accurate description comes from the Zen of Python. "Above correct syntax Pythonic code follows the normally accepted conventions of the Python community, and uses the language in a way that follows the founding philosophy." - Derek D. It's when used together you start to see the real value in these principles.Īlthough there is no official definition for the Pythonic way a little Googling gives you several answers along this general vain. Choosing one and just one is not going to do much for you. The most important thing to note about the SOLID design principles is they are meant to be used holistically. We will cover these in more detail shortly. Martin’s paper, “Design Principles and Design Patterns”. Michael Feathers can be credited for creating the mnemonic SOLID which is based on principles from Robert C. Since then I've been on a mission to prove SOLID code is Pythonic. I felt like people were using the Pythonic way to cop-out of writing more disciplined code. I didn't know what Pythonic code meant or looked like and none of the explanations offered were very satisfying.

#THREE PRINCIPLES FROM ZEN OF PYTHON HOW TO#

I was new to Python at the time so I didn't really know how to respond. I kept getting comments like "It's not a very Pythonic way to do things" during code review. Everywhere I took them they were generally well-received.except when I started working in Python. Over the years I've used these principles in C#, PHP, Node.js, and Python. People that know me will tell you I am a big fan of the SOLID Design Principles championed by Robert C.