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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3
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1answer
79 views

Best practices for a daemon that forks and becomes user

I want to write a small daemon in python under Linux that accepts connections and authenticates the user (details for this don't matter) and then forks a child for the connection and becomes the user. ...
2
votes
1answer
385 views

Merge two different API calls into One

I have two different apps in my django project. One is "comment" and an other one is "files". A comment might save some file attached to it. The current way of creating a comment with attachments is ...
1
vote
1answer
66 views

Multiple different versions of similar apps in one project

I need some help to improve the architecture of a site I've built. What I want to achieve within a single Django project is the following: I want a site that comes in several versions (one per ...
1
vote
1answer
489 views

Web application / Domain model integration using JSON capable DTOs

I'm a bit confused about architectural choices for the web-applications/java/python world. For c/c++ world the available (open source) choices to implement web applications is pretty limited to zero, ...
0
votes
1answer
113 views

Normalizing a numpy array

I checked a while back for questions relevant to my own about normalizing numpy arrays but couldn't find any. So I'll pose my question following this line of code: for i in ...
0
votes
1answer
86 views

Programming to multiple backends

My current project is a high-level abstraction package for GPIO programming on those nifty little SoC-Computers (Raspberry Pi, Cubieboard, Beaglebone Black, Pandaboard etc.). One of my goals is to ...
0
votes
1answer
87 views

Making API calls with celery

I'm designing a system for a client where the requirements are: they upload a JSON file (one object/line) make a call to an API with the JSON object as the payload record the state (success/failure) ...
0
votes
1answer
158 views

Setting up folders and importing modules in Python

I'm building an app to automate some processes that are annoying to do by hand (looking in a file, taking certain information out of a file, building another file with that information). My project ...
0
votes
1answer
188 views

Making a sldprt to PDB file converter?

I wanted to create a parser that can read a solidworks file and turn it into a protein data bank file. This has already been done in a program called DiamondCAD. ...
3
votes
0answers
198 views

Draw a Call Graph

I'm maintaining an old code base written in python. In particular there is a complex piece of code that from a module calls other functions from other modules that call other functions and so on. It ...
3
votes
0answers
70 views

auto update strategy for a software distributed as a tar ball written in python 2.7 targeting mac osx

This is what I have planned as an auto update strategy for a software that is as a tar ball. The application is running as a system daemon which means it have root privilege. App runs on startup ...
2
votes
0answers
66 views

Method object creation in Python data model

I've been reading the article on the data model of Python on its Reference website, and have been confused about this part: When the attribute is a user-defined method object, a new method ...
2
votes
0answers
420 views

How does the Zope Component Architecture (ZCA) relate to Service Component Architecture (SCA)?

I'm very new to the principle of Service Component Architecture and Zope in general, but the more I look, the more ZCA seems to be a good solution for a certain class of problems I often encounter. I ...
2
votes
0answers
130 views

The Python module-as-singleton hack

I've seen (and once used) this idiom a few times in Python: # At the end of a module: if __name__ == '__main__': main() # or whatever your entry point looks like, this line isn't important else: ...
2
votes
0answers
88 views

How should private dependency links be handled in setup.py

At work we use a private pypi server. This pypi server is specified as a dependency link: ... from setuptools import setup config = ConfigParser.ConfigParser() rc = ...
2
votes
0answers
172 views

The inheritance argument of zope.interface (providedby vs isinstance)

What limitations does inheritance of an interface through an abstract base class present that are addressed by zope.interface? In the following talk given in 2010 by Jeff Rush about interfaces, at ...
2
votes
0answers
275 views

Gevent - Make blocking calls non-blocking

I have the blocking code shown below. Is calling monkey.patch_all() enough/optimal to make it non-blocking? Does Gevent handle iterations like these? # front page def front_page(): database = ...
1
vote
0answers
20 views

How can I improve my websocket server's structure/flow?

I'm building a websocket server in python and I've hit a block regarding my program's flow and structure. Here's what I'm doing at the moment. The program creates a instance of 'server' and listens ...
1
vote
0answers
47 views

Logical Structure of PyQt or PySide application that conforms to reusability

I am making a PyQt application that has a QDialog UI as main widget that contains QTabWidget. This QTabWidget has two tabs, each tabs sits in a source folder under _widget. My goal is to build a ...
1
vote
0answers
156 views

Calculating uncompressed file size without uncompressing file in zlib

I am writing a python program which parses zip (currently only zlib, using DEFLATE compression) files and verifies the correctness of their headers and data. One of the things I'm trying to achieve is ...
1
vote
0answers
75 views

Code structure with MongoDB in python

I am new to MongoDB and python. I know how to make basic use of pymongo in order to manipulate documents. I am having trouble finding how to create some structure or governance in what gets inside ...
1
vote
0answers
238 views

How to Use Python as a “Macro” runner for a C# Application

I am working on an application that the user may wish to automate some features of (but we don't know what at the moment) I would like to provide them some kind of scripting interface so they can play ...
1
vote
0answers
35 views

Finding the largest bundle of flagged points

I am currently working to develop a program that takes in an array of 4 columns and around 200,000 rows. Each column represents x, y, z (coordinates), and a flag denoting whether or not this point is ...
1
vote
0answers
86 views

Structuring a multi-language project?

I'm working on a project which involves writing code for multiple devices, each in its own language (in particular, Arduino and Python). I want to contain the entire project in a single directory, but ...
1
vote
0answers
60 views

Need to add websocket support to a single page that's running a wsgi service

Current setup. I have a legacy ERP system (Thoroughbred) and i then have several in house applications (CRM, WMS) and a website that interact with it via an xml server and straight ODBC connections. ...
1
vote
0answers
59 views

Improve communication between controller and trackers in a Twitter fetcher tool using RabbitMQ or Apache Flume

I've been working for a time with some researches developing a tool to fetch tweets from Twitter and process them in some way. The first prototype "worked" but became a pain as we used sockets to ...
1
vote
0answers
65 views

Is there a standard practice on making a modular Python script?

I wrote a Python script for PIA here: pia-auto-login.py However, I need to make it more modular so that it does the OpenVPN changes from this script. Then I want to create two more packages (at ...
1
vote
0answers
1k views

Best practices to parse a log file using Python

I'm writing a Python tool to parse a log file from game server. The log file is of format: ms:classname::id::method::arg1::arg2.... There are a lot of classes, and a lot of methods for each class, ...
1
vote
0answers
277 views

Why does pkg_resources not find bloom in my virtualenv?

I'm trying to hack on the ROS bloom build system (https://github.com/ros-infrastructure/bloom). After I've made some edits, I build it and install it to a virtualenv to test using python setup.py ...
1
vote
0answers
110 views

Inheritance and constricted referencing

Let's say I have BaseA and BaseB classes. BaseB can have to several references of BaseA instances. Now, we have two other classes, DerivedA and DerivedB that respectively inherit from BaseA and BaseB. ...
0
votes
0answers
15 views

Reusing models and classes with blueprints with flask

Designing a content management system using Python/Flask. I have a blueprint module called pages [app/pages/..]. Pages contains the title, description and content. It can be queried using ...
0
votes
0answers
13 views

How much additional specialised functionality should I bundle with my main flask application?

I am building a custom content management system (i.e. html, some js) for a project using Flask/Python. As things have progressed, I have seen that I need to add: Some AJAX for interactivity. ...
0
votes
0answers
43 views

Is there an algorithm to avoid getting in hundreds of datapoints from API to represent a bar graph?

I am showing a graph on HTML5 canvas using the flot charting library for a between a start date and an end date. It's fine as long as the period is less than a year or so but if the user selects a big ...
0
votes
0answers
51 views

Writing a container that treats nearly-identical images as the same

I want to create a mapping in Python that will use images as keys, but treat similar (but not identical) images as the same key. I have an approach for deciding which images are similar enough: I ...
0
votes
0answers
24 views

Accessing data in widget

Background I started to get involved in a project written in python and wxPython (for the GUI). My task is to debug and add a few features to the GUI. The widgets are organised mainly with sizers, ...
0
votes
0answers
48 views

Utilizing Python Slate for pdf text extraction from PHP

I want to use Python Slate module for PDF text extraction, and I have my code up and running for this. What I would like to know here is how to link my existing PHP MVC to utilize/make a request to ...
0
votes
0answers
70 views

Will this data mining approach work? Is it a good idea?

I need to extract fields like the document number, date, and invoice amount from a bunch of .csv files, which I believe are referred to as "unstructured text." I have some labeled input files and will ...
0
votes
0answers
24 views

Ipython3 development cycle

I am new to python (python3) and am using Ipython3 while writing the code just in my preferred text editor. I am not yet sure what is a good development cycle as I keep getting problems with reloading ...
0
votes
0answers
30 views

Synchronising a set of data against elasticsearch

So I have a situation where I get in a lot of large XML files and I want that data synchronised on elasticsearch. Current way Have index_1 When data is updated create blank index_2 Load all of ...
0
votes
0answers
72 views

Matching groups of similar lines on a generic matching algorithm

I have to write a program to search through a file containing lines and find lines that match to a degree of tolerance but are not necessarily the same. So for example the following lines would match: ...
0
votes
0answers
64 views

Is Python Logging in a WSGI application a best practice a production environment?

I am trying to log my webpage access to a database. It is a requirement. It seems to be a difficult thing to do outside of Windows IIS, and I do not wish to use Python with IIS. My options seem to ...
0
votes
0answers
59 views

Extending the interface of existing (python) classes

I use a library with an existing well-defined interface, that I have extended for my purposes. I.e. most classes in that library inherit of one abstract base class class Parent(object): def ...
0
votes
0answers
88 views

Algorithm for the Simplication and Evaluation of Equations

As a new programmer messing around in python, I've been playing about with writing small programs which can calculate some of the stuff I did in maths at school. I've been trying to think of a way ...
0
votes
0answers
54 views

python: area mapping using trigonometric circle

I have a car controlled by a raspberry pi, I would like to create maps to each place it visits. The solution I came up with is simple. Lets say you tell the car to go forward and then after 5 minutes ...
0
votes
0answers
40 views

Strategy for “multi-level equality” test

It is well-known that Lisp supports multi-level equality test. I want to implement similar multi-level equality test on a custom class in Python. I know that I can (and should) override the __eq__, ...
0
votes
0answers
38 views

moving Data mining model from “lab” to production environment

I am designing the architecture of an analytics system . I have a data mining ensemble model developed in scikit learn . I want to move this to the production environment so the new incoming data can ...
0
votes
0answers
167 views

Python - Flask controller structure

This is my first python application (I have some experience in Java/groovy-grails), and therefore I am not confident of the application structure I should be following. My application has two ...
0
votes
0answers
76 views

Converting large files in python

I have a few files that are ~64GB in size that I think I would like to convert to hdf5 format. I was wondering what the best approach for doing so would be? Reading line-by-line seems to take more ...
0
votes
0answers
85 views

Check some value between each function call

Can you recommend a nice way of checking a particular value between calls to a set of functions? E.g. something like this in Python (might not be terribly 'Pythonic'): self.error_code = 0 # this ...
0
votes
0answers
132 views

How to algorithmically add notes to an existing midi file relative to positions of existing notes in python

I have a midi file that I'd like to algorithmically add notes to relative to other notes that already exist in the midi file using python, or if it's easier using a different language I'm open to that ...