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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2
votes
1answer
64 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. ...
0
votes
0answers
23 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 ...
2
votes
1answer
35 views

log method calls per object

How to log method calls on a per object basis for a particular class? I.e. after instanciating a = myClass() I somehow want to keep a log for what methods have been called on a like a.reverse() ...
-4
votes
1answer
67 views

How do I use a list of int to set the index of another list [closed]

I want to use a list called index with only ints to use it to set the index of another list. index = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26] dictionary = ["a", "b", ...
3
votes
3answers
82 views

How to structure project where a library and application using the library are concurrently developed?

I am planning to develop a new application that will heavily use a library that will be developed from scratch specifically for the application, but made general enough for it to be used for other ...
1
vote
2answers
83 views

Efficient way to handle foreign keys

I am building a script that checks a large network of sites for invalid links. The idea is to flag links that continuously show as not available so that they can be cleaned by the administration team. ...
-6
votes
1answer
149 views

I wrote a Python Switch statement [closed]

I wrote a python switch statement. I have seen a number of of examples that were outlandish and I was wondering if my switch statement is worth having and as it is written, what is a better way to ...
-5
votes
1answer
86 views

Linux on USB for Python (or other) Programming on the go? [closed]

This is my first question and I didn't see a similar question asked. Sorry if I didn't search hard enough. To the point. I'm learning the Python programming language and I've read Linux plays very ...
-1
votes
2answers
64 views

python code style for long lists [closed]

when coding a very long list in python, is it better to fit several items on each line or should I limit it to 1 per line? 99% of the time I would go with style2 below but I have 5 lists each about ...
0
votes
1answer
68 views

Python replace function for classes? Like namedtuple _replace?

Does the Python standard library offer anything similar to the custom replace function below? I can put this in my own *utils module, but I'd rather use a standard library implementation. Also, this ...
0
votes
1answer
56 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
3answers
175 views

Best algorithm to determine whether two arrays can be the same in a circular queue

I'm trying to figure out an efficient way to determine whether two distinct arrays of the same size can be shifted to form the same circular queue. For example: Array1 = ['A','B','C','D'] Array2 = ...
1
vote
2answers
111 views

Difference between PyPy and JVM

From my understanding the default Python interpreter(CPython) compiles source code into bytecode and then interprets the bytecode into machine code. PyPy on the other hand makes use of JIT to optimize ...
1
vote
2answers
205 views

Is it good programming practice to create files with no extension? [closed]

I often store data in external files when Python coding. Should I always save them with an extension - i.e. .txt? Is there any reason not to (other than saving bytes) to not give the extension? I ...
24
votes
6answers
3k views

Can you implement “object-oriented” programming without the class keyword?

Say we want to provide an abstraction of an "account" in a bank. Here's one approach, using a function object in Python: def account(): """Return a dispatch dictionary representing a bank ...
3
votes
3answers
161 views

How to best encapsulate features in code and enabling/disabling them at runtime?

I would like to be able to abstract each feature developed by the team in a way that it can be enabled or disabled at runtime by using a distributed shared configuration system. Features are small and ...
2
votes
1answer
86 views

Break big method into 2 methods, first containing a “for” loop and second a “break”

A method grew too big for its own good, and I need to break it up into two separate methods. def big_method(dct): # Initial code # ... for i in dct: # More code # ... ...
0
votes
1answer
53 views

Changing coordinate systems in python

I am working on a visual python program that is meant to model the orbit of an electron around the core of a Hydrogen atom. In order to avoid the singularity at r = 0 in the equation for coulomb ...
3
votes
1answer
82 views

Encapsulating mutable objects with special structure in Python

I am writing a library for working with special types of trees, called Foo trees. A Foo tree has very special structure. There some operations, called bar and baz, which only make sense on Foo trees. ...
0
votes
3answers
160 views

Python: Are all dictionary comprehensions just more expressive and compact for loops? [closed]

Recently, to describe dictionary comprehensions in Python, I wrote: dictionary comprehension is just a more compact & expressive way of writing the same logic as for loops (performance may ...
5
votes
2answers
116 views

How do I model partial dates in Python? Like an unknown year, or unknown day of the month?

I want to be able to capture facts like Bob was born in 2000 and Bill's birthday is May 7th. In both examples we know only part of the person's birth date. In one case we know only the year; in the ...
4
votes
3answers
101 views

Parent class using methods defined in child

I am working on a large program (more than 10k lines of code). Below is a (hopefully not over-simplified) example of a problem I sometimes face: class MyClass1(object): def func_1(self): ...
1
vote
2answers
131 views

Is it a good idea to install more libraries than you need? [closed]

I decided to try Anaconda, it seems that too many large companies are using it. I was amazed by the number of libraries included by default installing: python-2.7.9-2 ... installing: ...
1
vote
2answers
129 views

Complex data structure in python: just dict, etc, or some classes?

Consider a web service API that returns a complex Json object. Using the stock Python tools for the job, this will read in from the web service as a dict which contains, in turn, a mixture of arrays, ...
0
votes
2answers
37 views

Python packages from an operations perspective

As a developer I am used to keep my Python tools updated. Especially packages needed for installing and bundling. Using the most recent releases of pip, virtualenv and setuptools is in my personal ...
0
votes
2answers
64 views

Testing binary stream

I am building a binary file importer using Python. The specific file structure is defined in a specification. This looks like: File Map Block String, Short Integer, Long Integer, String, Short ...
1
vote
1answer
58 views

Python - best way to have interdependant variable in a class

Newbie Python questions: I want to model something that can have a several inter-connected instance variables and if I set one, I want to recalculate the others. Any can be set. E.g. a circle - each ...
4
votes
4answers
344 views

Legitimate cases of having .equals() behaving inconsistently with .compareTo()?

Java documentation says it's "strongly recommended" to have them behaving consistently. But are there legitimate cases of java/c#/python/etc Object.equals() method behaving inconsistently with the ...
3
votes
2answers
127 views

Should static analysis be integrated with code review? [closed]

I want to integrate various static analysis tools, and then add the results as comments on a file within code review tools, such as Stash or Review board. I am exploring the feasibility of writing ...
5
votes
1answer
251 views

Python rectangle packing

I'm working on a project which involves packing multiple rectangles in a larger rectangle(the bounding box). Rectangles can't overlap with each other or with the boundaries of the bounding box. ...
3
votes
4answers
148 views

Finding the first index in which the element and the index are the same

I am to build a python function that takes a sorted list of numbers and outputs the first index the is equal to the element in its place. It should run on O(log n) which I know how it should be ...
0
votes
1answer
86 views

How to write a suitable recurrence relation for a python function?

I have an exercise in which I am require to build a recursive function that takes a natural number and returns "True" if it is divisible by 3, or "False" otherwise, using the 3-divisibility rule. Then ...
-3
votes
1answer
85 views

Executable File Size Difference Between Python and C [closed]

Does using lower level programming languages have benefit of generating lesser file size when creating an executable, in contrast to using higher level languages for the same algorithm?
0
votes
1answer
73 views

Translation algorithm - combinations to indices

I have a deck of 52 poker cards represented as array of int - [0, 1, ... 51]. There are 2.598.960 possible combinations of 5 cards. I can generate all combinations like this: #id #combination ...
0
votes
1answer
72 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
3answers
150 views

Why python function programming functions are not collection methods? [duplicate]

In other words, is there a Python design related reason for it to be so? Functions like map, filter, reduce etc. are just plain functions. Is it just a poor design choice (if it is a good one, ...
0
votes
0answers
28 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
1answer
115 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 ...
-1
votes
1answer
48 views

Python 3 PyPy implementation? [closed]

I would like to use the PyPy Python JIT Implementation using Python 3. However I can only seem to install it using Python 2. Is there even an experimental implementation of PyPy for Python 3 I can try ...
3
votes
1answer
167 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 ...
1
vote
1answer
85 views

When should one create a new py-function rather than tweaking another one?

Me and a co-developer are arguing when it's wise to cast a new function rather than tweaking another one. By tweaking I mean an option or a hidden check in an existing function. The question could be ...
0
votes
1answer
102 views

Django urls.py runs only once. Why? How does it call views on next request?

While testing django cashing on our development server, one of our senior asked if is it possible to change the value of caching timeout on urls.py without restarting the http service. On first note, ...
2
votes
1answer
105 views

Python beginner question with Assigning Variables

Coming from C# and now getting my hands dirty with Python. From what I understand, Python is strongly typed: http://stackoverflow.com/questions/11328920/is-python-strongly-typed As stated in the ...
0
votes
0answers
68 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: ...
1
vote
0answers
138 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 ...
0
votes
0answers
27 views

Common to include pre-built binaries for supporting build tools? [duplicate]

As part of a Visual Basic 6 project, I have created a python script to provide a CLI to building the project/docs. However, I realize that not all developers who will have access to this project will ...
1
vote
3answers
270 views

Check distance between all elements in a list of numbers in O(n*lg(n))

I have an exercise for my algorithms and data structures class, where I basically have to implement a divide and conquer algorithm or function called check_distance to determine whether all numbers in ...
0
votes
0answers
55 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
52 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 ...
3
votes
1answer
103 views

Structure project based on platform or design?

I have a medium sized project (~10,000 lines) that runs on Windows and Linux. However it is only specific components of the program that are platform dependent and are located in a folder called ...