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  Python internals: how callables work

[The Python version described in this article is 3.x, more specifically - the 3.3 alpha release of CPython.] The concept of a callable is fundamental in Python. When thinking about what can be "called", the immediately obvious answer is functions. Whether it’s user defined functions (written by you), or builtin functions (most probably implemented in C inside the CPython interpreter), functions were meant to be called, right? Well, there are also methods, but they’re not very interestin...

1,317 0 0          PYTHON RATIONALE CALLABLE WORK


  Currying in Python

What is Currying? Currying is like a kind of incremental binding of function arguments. Let’s define a simple function which takes 5 arguments: 1def f(a, b, c, d, e):2    print(a, b, c, d, e) In a language where currying is supported, f is a function which takes one argument (a) and returns a function which takes 4 arguments. This means that f(5) is the following function: 1def g(b, c, d, e):2    f(5, b, c, d, e) We could emulate this behavior the foll...

3,111 0 0          PYTHON IMPLEMENT CURRING BINDING


  Python internals: adding a new statement to Python

This article is an attempt to better understand how the front-end of Python works. Just reading documentation and source code may be a bit boring, so I’m taking a hands-on approach here: I’m going to add an until statement to Python. All the coding for this article was done against the cutting-edge Py3k branch in the Python Mercurial repository mirror. The until statement Some languages, like Ruby, have an until statement, which is the complement to while (until num == 0 is equivalent to ...

1,607 0 0          PYTHON RESEARCH NEW STATEMENT ADDITION


  Python Performance Tips, Part 1

To read the Zen of Python, type import this in your Python interpreter. A sharp reader new to Python will notice the word “interpreter”, and realize that Python is another scripting language. “It must be slow!” No question about it: Python program does not run as fast or efficiently as compiled languages. Even Python advocates will tell you performance is the area that Python is not good for. However, YouTube has proven Python is capable of serving 40 million videos per hour. All ...

2,003 0 0          TIPS PERFORMANCE PYTHON EFFICIENCY


  Why so many Python web frameworks?

When asked about the plethora of web frameworks for Python the answer is often that it is way too easy to put together one in Python. That certainly seems plausible since there are so many libraries that implement the components of a web framework and if it's easy to plug those pieces together then maybe that lowers the bar of entry for new frameworks. So let's give it a shot, we'll pick some components and spend a couple hours seeing how far we can get building a web framework, which we...

1,961 0 0          WEB DESIGN PYTHON WEB FRAMEWORK DYNAMIC SCRIPTING LANGUAGE


  Python: calculate lighter/darker RGB colors

Many times color palettes have lighter and darker variations of the same color. This may be used to convey relative importance, or for something as simple as a gradient. Usually the designer will specify both colors. However, if you have a site that needs to allow user configurable styling, you may not want to ask the user for two variations of the same color. Here is some Python code to take a single color in RGB, and output an artitrarily lighter or darker variation of the same color...

4,945 0 0          PYTHON RGC COLOR CALUCALTION LIGHTER/DARKER


  Why Python is important for you

I believe that Python is important for software development. While there are more powerful languages (e.g. Lisp), faster languages (e.g. C), more used languages (e.g. Java), and weirder languages (e.g. Haskell), Python gets a lot of different things right, and right in a combination that no other language I know of has done so far. It recognises that you’ll spend a lot more time reading code than writing it, and focuses on guiding developers to write readable code. It’s possible to write obf...

3,500 0 0          PYTHON IMPORTANCE PARADIGM


  Create successful Python projects

The ecosystem for open source Python projects is both rich and diverse. This enables you to stand on the shoulders of giants in the production of your next open source project. In addition, it means that there's a set of community norms and best practices. By adhering to these conventions and applying the practices in your project, you may gain wider adoption for your software. This article covers practi...

1,475 0 0          OPEN SOURCE PYTHON PROJECT TEAM MANAGEMENT