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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162
votes
9answers
44k views

Why do people hesitate to use Python 3?

Python 3 was released in December 2008. A lot of time has passed since then but still today many developers hesitate to use Python 3. Even popular frameworks like Django are not compatible with Python ...
116
votes
15answers
17k views

Is it always a best practice to write a function for anything that needs to repeat twice?

Myself, I can't wait to write a function when I need to do something more than twice. But when it comes to things that only appear twice, it's a bit more tricky. For code that needs more than two ...
90
votes
9answers
53k views

Why is Python used for high-performance/scientific computing (but Ruby isn't)?

There's a quote from a PyCon 2011 talk that goes: At least in our shop (Argonne National Laboratory) we have three accepted languages for scientific computing. In this order they are C/C++, ...
75
votes
8answers
12k views

Are there any design patterns that are unnecessary in dynamic languages like Python?

I've started reading the design pattern book by the GoF. Some patterns seem very similar with only minor conceptual differences. Do you think out of the many patterns some are unnecessary in a ...
73
votes
6answers
8k views

Why was Python's popularity so sudden? [closed]

Python first appeared in 1991, but it was somewhat unknown until 2004, if the TIOBE rankings quantify anything meaningful. What happened? What caused the interest in this 13 year old language to go ...
60
votes
7answers
60k views

Why use try … finally without a catch clause?

The classical way to program is with try ... catch. When is it appropriate to use try without catch? In Python the following appears legal and can make sense: try: #do work finally: #do ...
59
votes
8answers
13k views

Defensive Programming vs Exception Handling?

I'm working through the book "Head First Python" (it's my language to learn this year) and I got to a section where they argue about two code techniques: Defensive coding vs Exception handling. Here ...
57
votes
3answers
24k views

Why Was Python Written with the GIL?

The global interpreter lock (GIL) seems to be often cited as a major reason why threading and the like is a touch tricky in Python - which raises the question "Why was that done in the first place?" ...
52
votes
6answers
46k views

'import module' vs. 'from module import function'

I have always been using this method: from sys import argv and use argv with just argv. But there is a convention of using this: import sys and using the argv by sys.argv The second method ...
51
votes
1answer
35k views

Module vs. Package?

Whenever I do from 'x' import 'y' I was wondering which one is considered the 'module' and which is the 'package', and why it isn't the other way around?
47
votes
2answers
30k views

What's wrong with relative imports in Python?

I recently upgraded versions of pylint, a popular Python style-checker. It has gone ballistic throughout my code, pointing out places where I import modules in the same package, without specifying ...
41
votes
13answers
9k views

How does Python's handling of line-breaks differ from JavaScript's automatic semicolons?

Javascript has a feature called Automatic Semicolon Insertion where basically if the parser encounters an invalid token, and the last token before that was a line break, then the parser will insert a ...
41
votes
8answers
10k views

How can I learn to effectively write Pythonic code?

Doing a google search for "pythonic" reveals a wide range of interpretations. The wikipedia page says: A common neologism in the Python community is pythonic, which can have a wide range of ...
41
votes
2answers
5k views

How do I move away from the “for-loop” school of thought?

This is a rather conceptual question, but I was hoping I could get some good advice on this. A lot of the programming I do is with (NumPy) arrays; I often have to match items in two or more arrays ...
40
votes
7answers
6k views

Are small amounts of functional programming understandable by non-FP people? [closed]

Case: I'm working at a company, writing an application in Python that is handling a lot of data in arrays. I'm the only developer of this program at the moment, but it will probably be ...
40
votes
12answers
6k views

Is C# development effectively inseparable from the IDE you use?

I'm a Python programmer learning C# who is trying to stop worrying and just love C# for what it is, rather than constantly comparing it back to Python. I'm caught up on one point: the lack of ...
40
votes
3answers
5k views

Experience of Python's “PEP-302 New Import Hooks” [closed]

I'm one of the developers of Ruby (CRuby). We are working on Ruby 2.0 release (planned to release 2012/Feb). Python has "PEP302: New Import Hooks" (2003): This PEP proposes to add a new set of ...
39
votes
16answers
35k views

Why such popularity with Python? [closed]

Other than being annoyed at whitespace as syntax, I'm not a hater, I just don't get the fascination with Python. I appreciate the poetry of Perl, and have programmed beautiful web services in bash ...
37
votes
6answers
3k views

Should I create a class if my function is complex and has a lot of variables?

This question is somewhat language-agnostic, but not completely, since Object Oriented Programming (OOP) is different in, for example, Java, which doesn't have first-class functions, than it is in ...
36
votes
3answers
32k views

Why is Python written in C and not in C++? [closed]

In Python's tutorial one can read that Python's original implementation is in C; On the other hand, the Python implementation, written in C, (...) I'm very curious why was Python written in C ...
36
votes
4answers
4k views

Python Forgiveness vs. Permission and Duck Typing

In Python, I often hear that it is better to "beg forgiveness" (exception catching) instead of "ask permission" (type/condition checking). In regards to enforcing duck typing in Python, is this try: ...
36
votes
5answers
4k views

Java dev learning Python: what concepts do I need to wrap my head around?

Background: I've run through a few tutorials and written some small projects. All is going well enough using Google and StackOverflow. Several times in the last few days I've found myself wondering ...
35
votes
6answers
5k views

Why aren't there other programming languages that compile to Python bytecode?

In Java, there are multiple languages that compile to Java bytecode and can run on the JVM -- Clojure, Groovy, and Scala being the main ones I can remember off the top of my head. However, Python ...
32
votes
4answers
38k views

Why store a function inside a python dictionary?

I'm a python beginner, and I just learned a technique involving dictionaries and functions. The syntax is easy and it seems like a trivial thing, but my python senses are tingling. Something tells me ...
31
votes
9answers
6k views

Is the algorithm more important than the programming language?

During the current (2013) Google Code Jam contest, there was a problem that took C++ and Java people 200+ lines of code as compared to Python people that solved the same problem only using 40 lines of ...
31
votes
4answers
15k views

Why do iterators in Python raise an exception?

Here's the syntax for iterators in Java (somewhat similar syntax in C#): Iterator it = sequence.iterator(); while (it.hasNext()) { System.out.println(it.next()); } Which makes sense. Here's ...
31
votes
5answers
40k views

Is Python Interpreted or Compiled?

This is just a wondering I had while reading about interpreted and compiled languages. Ruby is no doubt an interpreted language, since source code is compiled by an interpreter at the point of ...
29
votes
4answers
3k views

Concrete examples of Python's “only one way to do it” maxim [closed]

I am learning Python and am intrigued by the following point in PEP 20 The Zen of Python: There should be one-- and preferably only one --obvious way to do it. Although that way may not be ...
29
votes
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 ...
28
votes
3answers
18k views

What is the name of ** in python?

When programming Python I sometimes do a ** to make a conversion. I understand what it does but what data structures am I manipulating? A dict and what is the other? An array? Is there a name for the ...
28
votes
3answers
7k views

Should I pass in filenames to be opened, or open files?

Suppose I have a function that does things with a text file - for example reads from it and removes the word 'a'. I could either pass it a filename and handle the opening/closing in the function, or ...
27
votes
6answers
16k views

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 ...
26
votes
6answers
4k 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 ...
26
votes
4answers
7k 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 ...
25
votes
8answers
3k 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 ...
25
votes
7answers
22k 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 ...
25
votes
6answers
4k 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 ...
25
votes
5answers
9k 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 ...
24
votes
5answers
18k views

Is it a good practice to declare instance variables as None in a class in Python?

Consider the following class: class Person: def __init__(self, name, age): self.name = name self.age = age My coworkers tend to define it like this: class Person: name = ...
23
votes
8answers
21k 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 ...
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 ...
23
votes
3answers
5k 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 ...
21
votes
9answers
6k 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 ...
21
votes
3answers
12k views

Difference between a REPL and interactive shell

Noob question. I am not quite able to tell the difference between a REPL and an interactive shell just by reading the definitions on Wikipedia. Wiki notes that REPL is a particular kind of ...
20
votes
4answers
14k views

Purpose of `return self` from a class method?

I came across something like this in an open-source project. Methods that modify instance attributes return a reference to the instance. Would you trust code that is written like this? class ...
20
votes
3answers
36k views

Why Python and not Lua? [closed]

Why has Python been backed by google and become so rapidly popular and Lua has not? Do you know why Lua has stayed in background?
20
votes
3answers
805 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 ...
19
votes
11answers
5k 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 ...
19
votes
3answers
5k views

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 ...
19
votes
7answers
7k 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 ...