Python is a dynamic, high-level language. Its design focuses on clear syntax, an intuitive approach to object-oriented programming, and making the right way to do things obvious. Python supports modules, exceptions, had an extensive standard module library. Python can also be embedded in other ...

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1answer
116 views

How to structure huge conditional statement?

I'm creating some kind of a "personal assistant" application which is basically a web service that receives a message and then does something according to it. For example I send "what time is it?" ...
4
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2answers
166 views

If I create a desktop application using Tkinter, PyGTK or PyGame does my app have to be open source?

I intent to start learning desktop gui programming, so I've been looking to Python and it's Tkinter, PyGTK and PyGame. But I want to make proprietary software, so I'm concerned because of the licences ...
0
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0answers
75 views

Class design of keyboard interpreter to execute commands

I'm designing a keyboard interpreter that will map typed characters to a (or many) command(s) via a hierarchical menu-style structure, taking into consideration testability (ideally TDD). However I'm ...
1
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0answers
79 views

Does PyPy or Jython run untrusted Python 3 code more secure while still being fast?

I know that one can not securely restrict normal CPython's capabilities to properly run foreign code without allowing it to access some builtins like open() or allowing other kinds of I/O. So I ...
3
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1answer
179 views

Etiquette: How to respond to a Open source release Mail? [closed]

So I was lucky to be able to contribute to DateUtil in python(just a small documentation). I recently received a mail regarding the release 2.5.0 . So I was all exited because it was the first time I ...
3
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1answer
122 views

Confused about approach I should take to designing classes for a card game

My primary goal is to create a Euchre game in Python. Euchre card games are rare on the Linux platform, no matter the language or the desktop flavor of choice. For now I want to be able to just ...
2
votes
1answer
126 views

Should I store cryptographic hashes as a blob or as a string?

I'm new to MongoDB and am wondering how to decide to store some cryptographic hashes. Should I store the binary data itself, as a blob, or should I store its string representation as a string? My ...
3
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0answers
86 views

How to think about a schedule that pulls from a database as objects

I am working on a personal project using Python. I have been using version control to the best of my abilities and if you would like to check it out and run the app https://github.com/CodeAmend/old-...
4
votes
2answers
513 views

Why do textbooks use pseudocode rather than real languages?

In colleges and in algorithm textbooks, it is quite common for the teacher and author to explain control flow in pseudo-code. With the advent of more expressive languages like Python and Haskell among ...
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0answers
31 views

Python: architecture implications of using external subprocess or API

I maintain a Python 3 package (ocrmypdf) that works with other programs primarily by making subprocess calls. This is partly for historical reasons – it is shell script that grew up. I have since ...
3
votes
3answers
130 views

Pattern for requests with long response times?

We are currently maintaining a homegrown python "web server" where generating the response for some requests can take a very long time mostly due to heavy computations - these requests are basically ...
2
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1answer
63 views

Initializing composite classes in Python

I am writing a Python system where I have a major class(PlayerModel) that has two another classes as members (StateModel and ActionModel). I was wondering, what is the correct way to initialize such ...
7
votes
1answer
199 views

How should the code for a program outputting to command line be tested/designed?

Imagine a program similar to this in Python: import subprocess class Example(): _cmd_args = (['ls', '-a', '/usr/bin/'], ['ls', '-al', '/usr/local/bin/']) _default_args = 0 def init(...
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1answer
135 views

What is considered best practice for custom exception classes?

Python has many strong conventions but I'm unclear on how best to manage exceptions for my module. I know it's generally good practice to define a custom exception for your module. E.g.: class ...
0
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0answers
53 views

How to distribute a project with all its dependencies?

We are developing a system for a customer that does not want to allow installation of packages from outside repositories. The project is in Python and defines its dependencies via setuptools; most of ...
0
votes
1answer
100 views

How to make it clear I'm violating Command Query Separation

Command Query Separation is a useful principle, though it's not always ideal. Sometimes you need to run a process, which will result in useful data you need to return. My specific case is uploading a ...
0
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3answers
145 views

Why don't empty iterables in python raise Exceptions when you try to iterate over them [duplicate]

I find this behaviour in Python quite peculiar and I believe it can lead to many bugs especially if you have a function/method that takes in a list and returns another list after carrying out some ...
1
vote
1answer
106 views

Parsing JSON and creating analytics out of the data, what is the best way to do it?

I am on a project where I call an API and I want to make statistics with the data returned. It returns a big .json object. As that is not possible to flatten, and I am not interested on all the data ...
7
votes
4answers
312 views

For Python programming and being Pythonic, why “never is often better than *right* now”? [closed]

In the Zen of Python, I can understand most parts of it, except: Now is better than never. Although never is often better than *right* now So I think doing it now or getting results now is better ...
1
vote
1answer
62 views

Is it a common pattern in Python to have instance variables assigned in a constructor start with an underscore?

I recently started using UtilSnips, a Vim plugin allowing for a certain level of automation while coding by using template-like code snippets for common code fragments (class and function definitions, ...
6
votes
1answer
2k views

Python file naming convention?

I've seen this part of PEP-8 https://www.python.org/dev/peps/pep-0008/#package-and-module-names I'm not clear on whether this refers to the file name of a module/class/package. If I had one example ...
1
vote
1answer
83 views

Does exception handling belong at the lowest level of the runtime?

I'm designing a fairly simplistic stack-based programming language, and implementing it in Python. (no link, because it's not fully implemented yet.) The language itself is essentially intended to be ...
0
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0answers
28 views

How can word lists be used as supervised data in finding the score of the report?

We have got historical reports and we need to find the score (whether report is effective or useful or not) based on supervised learning. While doing the supervised learning process, we have to ...
1
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2answers
84 views

Should I include scripts inside a Python package?

In my Python application, I can distinguish between entry points (scripts) and what I think of as library code. My instinct is to put the library code inside a package, and the scripts elsewhere ...
5
votes
4answers
259 views

Handling exceptions I don't know about

When I work with handling exceptions, I notice that I often have to deal with the ones I had no idea about. Especially it is noticeable when I program a method that grabs data from web. An error may ...
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2answers
1k views

Why is Python 3.4 still developed after the release of 3.5? [closed]

The lastest version of Python is 3.5.1. However, the latest release is 3.4.4. Why is 3.4.x still developed? Are there breaking changes in 3.5 with respect to 3.4? https://www.python.org/downloads/
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2answers
298 views

How to approach hours forecasting

I need to forecast budgeted hours for 2 departments to help them schedule staff as currently the best they can do is just wing it. When we receive a job proposal I'll have the person submitting the ...
-1
votes
1answer
109 views

Developing an app using Django. Do I design front-end after app? Or develop Django to fit UI? [duplicate]

Edit: this differs from a similar question because I'm interested specifically in how Django works with the front-end. I.e. what is considered best practice when developing using the Django framework. ...
1
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0answers
34 views

How do I minimize the number of database queries in a GeoJson API (of countries, and smaller areas) with custom data?

The general version of the question is above - a a little more detail, I am using Django Rest Framework, but am happy for answers to be dealing with the problem in abstract. So, I have data with ~200 ...
2
votes
1answer
67 views

Passing in objects to __init__ or passing a common param to and constructing objects inside __init__?

I have a class Foo that creates instances of other classes A, B, and C in its constructor. A, B, and C share the same constructor parameter and are used in other parts of the codebase, not just in Foo....
0
votes
1answer
114 views

How can you catch all index out of range errors in python?

Our program does these kinds of operations hundreds of times for many different variables and lists, then uses them throughout the program: variable = values[5] The list values are coming from the ...
2
votes
1answer
102 views

How to find related articles among a set of articles?

I'm utilising OpenCalais API to tag the articles from multiple news sources. I know which category each article belongs to (e.g. crime, politics etc). Also each article has three social tags ...
23
votes
1answer
2k views

Why does the documentation on some languages say “equivalent to” rather than “is”?

Why does the documentation on some languages say "equivalent to" rather than "is"? For example, the Python Docs say itertools.chain(*iterables) ... Equivalent to: def chain(*iterables):...
-2
votes
2answers
86 views

Detecting Persons In Seats from Image [closed]

I am attempting to build an attendance program which could analyze if someone is sitting in a seat. The seats are fixed making knowing where each seat is easy, but I don't really know where to start ...
3
votes
1answer
92 views

How do I manage quickly changing python modules

I write Python code for scientific computation. As it is research I face among other two problems: the demands are quickly changing results need to stay reproducable Imagine you have a package A ...
-2
votes
1answer
228 views

Create arithmetic expression from number using +-/* that equals target [duplicate]

For example, you are given the source 1234 and the target 24. The task is to use the standard arithmetic operators +-/* placed within source, without changing the order of the digits of source to ...
4
votes
3answers
406 views

Is it ok to have multiple classes in the same file in Python?

I'm freshly coming to the Python world after years of Java and PHP. While the language itself is pretty much straightforward, I'm struggling with some 'minor' issues that I can't wrap my head around — ...
6
votes
2answers
226 views

Is Python's inheritance an “is-a” style of inheritance or a compositional style?

Given that Python allows for multiple inheritance, what does idiomatic inheritance in Python look like? In languages with single inheritance, like Java, inheritance would be used when you could say ...
4
votes
1answer
167 views

Using Python's Method Resolution Order for Dependency Injection - is this bad?

I watched Raymond Hettinger's Pycon talk "Super Considered Super" and learned a little bit about Python's MRO (Method Resolution Order) which linearises a classes "parent" classes in a deterministic ...
2
votes
1answer
64 views

Question regarding the names of OrderedDict and defaultdict functions in Python

While reading Python Cookbook I came across these two lines: from collections import OrderedDict from collections import defaultdict Now see the naming conventions of the functions in ...
1
vote
1answer
71 views

How to choose python module license as python itself

I would like to publish a python module and would like to publish it as the same license of python Below is a example of how Perl module does: This library is free software; you can redistribute ...
11
votes
3answers
5k views

What are “class methods” and “instance methods”, in Python?

There has been a discussion in chat relating to a question (the question itself being irrelevant to this one), that has revealed I may not know Python whatsoever. In my mind, although terminology ...
1
vote
2answers
129 views

python - differences between reusable code vs. code for solving specific tasks

Reusable code (ex. libraries and frameworks) and code written to solve a specific task and not meant to be reused as a general tool (for example, code being used only by my 6 person team in a private ...
9
votes
1answer
225 views

Python's join seems to focus not on the items to join, but on the symbol, as compared to Ruby or Smalltalk, for a design reason?

I thought one of the cornerstone of OOP is that, we have objects, which are the items we are interested in dealing with, and then we send messages to them. So it may seem natural that, I have a ...
5
votes
1answer
221 views

Explicitly fill in requirements.txt for our Python projects?

As a user of pip install package and then pip freeze > requirements.txt, I was surprised to see a requirements.txt like this: # Flask # License: BSD # Upstream url: http://github.com/mitsuhiko/...
5
votes
1answer
199 views

What is the most efficient way to implement a RESTful client app?

I am working on a web application for ranking some products based on some factors. The user send a search query to 5 restful webservices which by their turn send a response in a JSON format and ...
5
votes
1answer
84 views

Signature-changing decorator: properly documenting additional argument

Let's say I have a custom decorator, and I want it to properly handle docstring of decorated function. Problem is: my decorator adds an argument. from functools import wraps def custom_decorator(f):...
3
votes
1answer
121 views

How to move Python doctest examples into another unit test framework?

Years ago AFAIK the mathematitician and software developer Tim Peters discovered that very often the documentation of APIs tends to get out of date over time during the software live cycle, because ...
4
votes
1answer
180 views

Refactoring of a client API for avoid duplicated code and unclear passage of parameters

I need to develop an API, the functions of the API are requests that call the service exposed by a server. Initially the API worked like this: class Server: def firstRequest(self, arg1, arg2): ...