Questions tagged [python]

Python is a dynamically typed, high-level interpreted programming 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 and exceptions, and has an extensive standard module library. Python is general-purpose and thus used widely, from the web to embedded systems.

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31
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4answers
11k views

Should I stick with or abandon Python to deal with concurrency?

I have a 10K LOC project written in Django with quite a deal of Celery (RabbitMQ) for asynchronicity and background jobs where needed, and have come to the conclusion that parts of the system would ...
31
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7answers
9k views

Functional programming compared to OOP with classes

I have been interested in some of the concepts of functional programming lately. I have used OOP for some time now. I can see how I would build a fairly complex app in OOP. Each object would know how ...
31
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5answers
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Best practices for execution of untrusted code

I have a project where I need to allow users to run arbitrary, untrusted python code (a bit like this) against my server. I'm fairly new to python and I'd like to avoid making any mistakes that ...
31
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2answers
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Is it conventional to raise a NotImplementedError for methods whose implementation is pending, but not planned to be abstract?

I like to raise a NotImplementedError for any method that I want to implement, but where I haven't gotten around to doing it yet. I might already have a partial implementation, but prepend it with ...
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9answers
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Are there any design patterns that are possible only in dynamically typed languages like Python?

I've read a related question Are there any design patterns that are unnecessary in dynamic languages like Python? and remembered this quote on Wikiquote.org The wonderful thing about dynamic typing ...
30
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Why doesn't Python need a compiler?

Just wondering (now that I've started with C++ which needs a compiler) why Python doesn't need a compiler? I just enter the code, save it as an exec, and run it. In C++ I have to make builds and all ...
30
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2answers
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python factory function best practices

Suppose I have a file foo.py containing a class Foo: class Foo(object): def __init__(self, data): ... Now I want to add a function that creates a Foo object in a certain way from raw source ...
30
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6answers
21k views

Which style to use for unused return parameters in a Python function call

Is there any recommended/generally accepted coding style for handling situations where a function returns a tuple of values but only one of those values is used afterwards (note that this is mostly ...
29
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6answers
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Programming language usage at Google [closed]

I have heard Google uses Python, Java and C++. But what I don't know is how is each of those programming language is used. I mean what is Python, Java and C++ is used for at Google. Why would they ...
29
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6answers
7k 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 account....
29
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1answer
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When developing a system by myself, should I use microservices?

I'm beginning a new project at work, and will likely be nearly the sole developer on the project, though one or two other developers will need to integrate existing applications or simple scripts into ...
29
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5answers
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Is it considered Pythonic to have multiple classes defined in the same file?

In working with python for the first time, I've found that I end up writing multiple classes in the same file, which is opposed to other languages like Java, which uses one file per class. Usually, ...
28
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5answers
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When to use a dictionary vs tuple in Python

The specific example in mind is a list of filenames and their sizes. I can't decide whether each item in the list should be of the form {"filename": "blabla", "size": 123}, or just ("blabla", 123). A ...
28
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3answers
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Why are C++ template error messages so horrific?

C++ templates are notorious for generating long, unreadable error messages. I have a general idea of why template error messages in C++ are so bad. Essentially, the problem is that the error isn't ...
28
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3answers
10k views

Why aren't there explicit access modifiers in Python:

If 'explicit is better than implicit', why aren't there explicit access modifiers in Python: Public, Protected, Private, etc.? I know that the idea is that the programmer should know what to do ...
28
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6answers
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Turning a personal Python project into a releasable library

I'm an academic rather than a programmer, and I have many years' experience writing Python programs for my own use, to support my research. My latest project is likely to be useful to many others as ...
28
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1answer
1k views

How to deal with a misnamed function in production code?

I've recently come across a Python library on GitHub. The library is great, but contains one glaring typo in a function name. Let's call it dummy_fuction() while it should be dummy_function(). This ...
27
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5answers
16k views

Is programming in Python faster than in C, C++ or Java? [closed]

There's a widespread belief among programmers that the more dynamic and loosely typed the language, the more productive the programmer will be in it. Guido van Rossum wrote about programming ...
27
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3answers
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How to efficiently store big time series data?

I need to store and to be able to query some very large amounts time series data. Properties of the data are as follows: number of series : around 12.000 (twelve thousand) number of data points, ...
26
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2answers
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Why is universal newlines mode deprecated in Python?

I just noticed that the universal newline feature of file operations seems to be on its way out. The documentation for Python 3.5 open's mode parameter indicates that it's deprecated: 'U' ...
26
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5answers
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How to have two different programmings with two different languages interact?

I don't know if this is too broad or not, but I am a youngish programmer still in college, its my Junior year. I feel like I have a pretty good grasps for different languages and have a pretty good ...
26
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4answers
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How to develop front end (UI) for my Django website

I am learning Django and new to web development. Please excuse me if you find this question too dumb. So, I am creating a Facebook application using Django which I would like to host in Google App ...
25
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7answers
27k views

Should we use python 2.6 or 2.7 or 3.x? [closed]

The version of python which I am using is 2.6, and there is a 2.7 and 3.x. Usually I use python for some trivial program/snippet. I realize there are some major difference between 2.x and 3.x. I would ...
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8answers
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Python interview questions [closed]

I am going to interview within two weeks for an internship that would involve Python programming. Can anyone suggest what possible areas should I polish? I am looking for commonly asked stuff in ...
25
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2answers
1k views

What semantic features of Python (and other dynamic languages) contribute to its slowness?

I don't know very well Python. I'm trying to understand more precisely what exact features of dynamic languages (à la Python, Lua, Scheme, Perl, Ruby, ....) are forcing their implementations to be ...
25
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3answers
24k views

Why isn't there a python compiler to native machine code?

As I understand, the cause of the speed difference between compiled languages and python is, that the first compiles code all way to the native machine's code, whereas python compiles to python ...
24
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8answers
23k views

Ruby or Python? [closed]

This question is extremely subjective and open-ended. It might even sound like something I should just research for myself and make my own decision. But I'd like to put it out there and get some ...
24
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7answers
13k views

Python productivity VS Java Productivity

Over on SO I came across a question regarding which platform, Java or Python is best for developing on Google AppEngine. Many people were boasting of the increased productivity gained from using ...
24
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8answers
4k views

Do frameworks put too much abstraction? [closed]

I've been programming for a little under a year and have some experience writing systems applications, web apps, and scripts for businesses/organizations. However, one thing I've never really done is ...
24
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4answers
6k views

Functional style exception handling

I've been told that in functional programming one is not supposed to throw and/or observe exceptions. Instead an erroneous calculation should be evaluated as a bottom value. In Python (or other ...
24
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3answers
27k views

Python - 'if foo in dict' vs 'try: dict[foo]'

This is less a question about the nature of duck typing and more about staying pythonic, I suppose. First of all - when dealing with dicts, in particular when the structure of the dict is fairly ...
24
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3answers
13k views

where exactly should python business logic be placed in django

I have just begun to learn Django/Python/Web Development. This problem has been troubling me for a while now. I am creating an application with multiple templates in Django. I have a views.py which ...
24
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1answer
7k views

Single python file distribution: module or package?

Suppose I have a useful python function or class (or whatever) called useful_thing which exists in a single file. There are essentialy two ways to organize the source tree. The first way uses a single ...
23
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5answers
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How to solve the problem of nested comments

It appears in not just one language that comments can't be nested. Do you have a good solution for this problem? One workaround in C/C++ and Java is to only use the single-line comment but it becomes ...
22
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9answers
11k views

Why there is no power operator in Java / C++?

While there is such operator - ** in Python, I was wondering why Java and C++ don't have one too. It is easy to make one for classes you define in C++ with operator overloading (and I believe such ...
22
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11answers
7k views

If we can do functional programming with Python, do we need a specific functional programming language? [closed]

Using generators and lambda, we can do functional programming with Python. You can also achieve the same thing with Ruby. So the question is: why do we need specific functional programming languages ...
22
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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): ...
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7answers
14k views

Learning to program in C (coming from Python) [closed]

If this is the wrong place to ask this question, please let me know. I'm a Python programmer by occupation. I would love to learn C. Indeed, I have tried many times, but I always get discouraged. In ...
22
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9answers
16k views

I feel stuck in the center of Python, How to get past beginner [closed]

I really apologize if this doesn't follow the S.O rules but I need a little help, I personally still classify myself as a beginner in python, Yet I've wrote a very small and VERY SURE impractical ...
22
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2answers
34k views

How does the Python Runtime actually work?

I have some problems understanding the concept of a runtime library, especially the Python one. So I have written some a hello world python program and intend to execute it, so I write python ./...
22
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2answers
10k views

SQLite with two python processes accessing it: one reading, one writing

I'm developing a small system with two components: one polls data from an internet resource and translates it into sql data to persist it locally; the second one reads that sql data from the local ...
22
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4answers
68k views

How to deal with database connections in a Python library module

I have created a library in Python that contains functions for accessing a database. This is a wrapper library around a third party application database, written due to the fact that the third party ...
21
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9answers
15k views

Is it essential to learn algorithms to be a real programmer? [closed]

I'm a PHP programmer, and until now I have not needed to learn algorithms... Now I'm start learning Python (a real programming language), because I need to use matplotlib. Does it make sense to start ...
21
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7answers
5k views

For what types of applications is Python a bad choice? [closed]

I just started learning Python, and I'd like to get some more context on the language. I realize that, in many cases, Python is a slow language relative to C or C++. Thus, Python is probably not the ...
21
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3answers
2k views

Why do so many languages treat numbers starting with 0 as octal?

I've read Where are octals useful? and it seems like octals are something that were once upon a time useful. Many languages treat numbers preceding with a 0 as octal, so the literal 010 is actually 8....
21
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4answers
8k views

Are there any negative side effects of splitting up large modules? [closed]

I was browsing a github project and found this module which has more than 10 thousand lines. Is it a common practice to have that much code in a single module? It seems to me that this should be ...
20
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6answers
7k views

Best practices in comment writing and documentation

Commenting nowadays is easier than ever. In Java, there are some nice techniques for linking comments to classes, and Java IDEs are good at making comment shells for you. Languages like Clojure even ...
20
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5answers
7k views

Is there any one standard framework for developing Python GUI apps.?

There are so many frameworks for writing GUI application using Python. But is there any one key standard framework? For example we have a bundle of .NET/C# on Visual Studio. I am thinking in other ...
20
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4answers
11k views

When and how should I use exceptions?

The Setting I often have trouble determining when and how to use exceptions. Let's consider a simple example: suppose I am scraping a webpage, say "http://www.abevigoda.com/", to determine if Abe ...
20
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3answers
845 views

How do I express subtle relationships in my data?

"A" is related to "B" and "C". How do I show that "B" and "C" might, by this context, be related as well? Example: Here are a few headlines about a recent Broadway play: David Mamet's Glengarry ...