Posted on Thu, 03 Nov 2016 in Python • Tagged with python, backtracking, recursion
As you know there is no tail recursion optimization in Python. Moreover it has a very low recursion limit. It can be a problem if you are trying to solve the problem using the backtracking algorithm. Recursion limit is big enough to solve sudoku, but an exception will raise if the problem has more possible solutions.
Posted on Thu, 06 Oct 2016 in Python • Tagged with python, type hinting
There is the PEP 526 implemented in Python 3.6 that adds optional type annotations for variables. It's replacement for type comments. There is one pitfall: adding type annotations for local variables can hide problems with code.
Posted on Fri, 09 Sep 2016 in Python • Tagged with python, dict, rest
Python developers tend to use dicts too much. Mainly I tell about pass data through application as dicts not objects. It's a bad design witch causes many problems.
Posted on Fri, 26 Aug 2016 in Java • Tagged with java, python, spring
I've added Java to my technology stack at work recently. We decided to do our new project using Spring Framework. For me it is a very interesting challenge, cause I've used Java only in my pet projects before. There are my very first impressions.
Posted on Fri, 29 Jul 2016 in Python • Tagged with python, mypy, type hinting
If you work on a big Python project, type hinting can help you to find many design and function usage problems. Of course, you have to use external tools for static analysis, such as mypy. This is a great tool, but supports Python 3 mainly. Support for 2.7 branch isn't so straightforward. There are a couple of tricks that allows you to use it for 2.7.
Posted on Thu, 07 Jul 2016 in Python • Tagged with python, conference, pycon
PyConRu 2016 finished. It was the best PyConRu conference. Usually If there are two useful talks, conference is good. This time I found useful many amazing talks enough to fill an entire day-long session.
Posted on Mon, 27 Jun 2016 in Python • Tagged with python, iterators
Couple days ago one of my colleagues asked me to implement simple self-logging iterator inherited from enumerate. I tried to inherit directly from it and failed. I absolutely forgot how to use __new__ magic method. It was so embarrassing. I was in a hurry, so I promised myself to solve this puzzle. And I can tell you it is a simple task. Actually it takes 18 lines of code only.
Posted on Tue, 14 Jun 2016 in Python • Tagged with pycon, python, conference
There is my list with 7 best PyCon 2016 videos. I don't say that other videos not good. I say that these videos are more useful for me or impress me more than others. And as you can see I prefer talks about Python internals. I hope you'll find this list helpful.
Posted on Thu, 09 Jun 2016 in Python • Tagged with Python, default params
Do you ask yourself why you souldn't use mutable types as default value for parameters in Python? I'm sure you ask at least if you are not a junior. Probably, your answer is "It causes to strange side effects". However, only a tiny part of python developers makes step throw and figure out how it works under the hood.
Posted on Wed, 01 Jun 2016 in Python • Tagged with kivy, gui, python
Kivy is an interesting project that allows you build GUI applications for different platform including iOS and Android. If you believe the rumors... I decided to check out is Kivy suits to build for small python GUI app for 5 major platforms: Mac OS X, Linux, Windows, iOS, and Android. In this series I'll try to build a small app for learning foreign language vocabulary and deploy it on all these platforms.