Writing an application in python what does that mean

In each application, the computer responds in different ways to your input, from the keyboard, mouse or a file. Still the underlying operations are determined by the design of the program you are given.

The code was written by Java developers who are relatively new to Python, and it suffers from some performance issues like a second startup time. In examining the code, I found that they had done lots of things that make sense in Java, but which suck terribly in Python.

So, the sad thing is that these poor folks worked much, much harder than they needed to, in order to produce much more code than they needed to write, that then performs much more slowly than the equivalent idiomatic Python would.

A static method in Java does not translate to a Python classmethod. The idiomatic translation of a Java static method is usually a module-level function, not a classmethod or staticmethod. And static final fields should translate to module-level constants. But do note that calling a classmethod involves an additional memory allocation that calling a staticmethod or function does not.

Oh, and all those Foo.

In Python, the lookups occur at runtime, so each dot counts. Got a switch statement? The Python translation is a hash table, not a bunch of if-then statments. The CPython dictionary implementation uses one of the most highly-tuned hashtable implementations in the known universe.

XML is not the answer. It is not even the question. Compared to Python code, XML is a boat anchor, a ball and chain. In Java, XML can be your savior because it lets you implement domain-specific languages and increase the flexibility of your application "without coding". In Java, avoiding coding is an advantage because coding means recompiling.

But in Python, more often than not, code is easier to write than XML. And Python can process code much, much faster than your code can process XML. Not only that, but you have to write the XML processing code, whereas Python itself is already written for you. If you are a Java programmer, do not trust your instincts regarding whether you should use XML as part of your core application in Python.

Not even just this once. Drop that schema and put your hands in the air, now! If your application or platform will be used by Python developers, they will only thank you for not adding the burden of using XML to their workload.

The only exception to this is if your target audience really really needs XML for some strange reason. There are also other, very rare, architectural reasons to need XML.

If in doubt, explain your use case for XML to an experienced Python developer. Getters and setters are evil.

Programming Languages

Evil, evil, I say! Python objects are not Java beans. Do not write getters and setters. They are a waste of CPU time, but more important, they are a waste of programmer time.

Not just for the people writing the code and tests, but for the people who have to read and understand them as well. In Java, you have to use getters and setters because using public fields gives you no opportunity to go back and change your mind later to using getters and setters.

So in Java, you might as well get the chore out of the way up front. In Python, this is silly, because you can start with a normal attribute and change your mind at any time, without affecting any clients of the class.

Code duplication is quite often a necessary evil in Java, where you must often write the same method over and over with minor variations usually because of static typing constraints.

Python Features

It is not necessary or desirable to do this in Python except in certain rare cases of inlining a few performance-critical functions.

You write a function that contains a function.then Python adds each of those arguments to that magic list. With this in hand, let’s build a version of benjaminpohle.com that always prints the per-patient mean of a single data file.

The first step is to write a function that outlines our implementation, and a placeholder for the function that does the actual work. Functions Defined. The core of extensible programming is defining functions. Python allows mandatory and optional arguments, keyword .

Jun 21,  · Why did Quora choose Python over Java for its development? There's only one comment "Java programs end up being longer and more painful to write than the equivalent Python programs". What exactly does it mean? May 27,  · You can use Python to create web applications on many levels of complexity.

There are many excellent Python web frameworks including, . This line mean that your flask app will being run if we run from benjaminpohle.com Notice also that we are setting the debug parameter to true. That will print out possible Python errors on the web page.

Python does not support a character type; these are treated as strings of length one, thus also considered a substring. A package is a hierarchical file directory structure that defines a single Python application environment that consists of modules and subpackages and sub-subpackages, and so on.

The write() method does not add a.