The "what's new" list looks pretty extensive. I've heard that this is considered a radical shift in the language. Any early adopters out there? Would you advise someone dipping their toes into the water to stick with version 2.x? Or dive into 3.0? ...
In "Programming Python", Mark Lutz mentions "mixins". I'm from a C/C++/C# background, and I've not heard the term before. What is a mixin? Reading between the lines of this example (which I've linked to, 'cause it's quite long) I'm presuming it's a case of using multiple inheritance to extend a class as opposed to 'proper' subclassing....
I have the following models: class Author(models.Model): author_name = models.CharField() class Book(models.Model): book_name = models.CharField() class AuthorBook(models.Model): author_id = models.ForeignKeyField(Author) book_id = models.ForeignKeyField(Book) With that being said, I'm trying to emulate this query using the ...
How can I get the Cartesian product (every possible combination of values) from a group of lists? Input: somelists = [ [1, 2, 3], ['a', 'b'], [4, 5] ] Desired output: [(1, 'a', 4), (1, 'a', 5), (1, 'b', 4), (1, 'b', 5), (2, 'a', 4), (2, 'a', 5) ...] ...
When you pass a collection like list, array to another function in python, does it make a copy of it, or is it just a pointer? ...
I have a list of lists that looks like this: [['Tom', 'Dick'], ['Harry', 'John', 'Mike'], ['Bob']] and I want to turn it into a dictionary where each key is a name and each value is a number corresponding to the position of its sublist in the list: {'Tom': 0, 'Dick': 0, 'Harry': 1, 'John': 1, 'Mike': 1, 'Bob': 2} I tried various li...
How do I create a GUID in Python that is platform independent? I hear there is a method using ActivePython on Windows but it's Windows only because it uses COM. Is there a method using plain Python? ...
Right now I have vector3 values represented as lists. is there a way to subtract 2 of these like vector3 values, like [2,2,2] - [1,1,1] = [1,1,1] Should I use tuples? If none of them defines these operands on these types, can I define it instead? If not, should I create a new vector3 class? ...
I know that Python has a global lock and i've read Glyph's explaination of python multithreading. But I still want to try it out. What I decided to do as an easy (conceptually) task was to do horizontal and vertical edge detection on a picture. Here's what's happening (pseudocode): for pixels in picture: apply sobel operator horiz...
Are there any Python object-relational mapping libraries that, given a database schema, can generate a set of Python classes? I know that the major libraries such as SQLObject, SQLAlchemy, and Django's internal SQL ORM library do a very good job of creating a DB schema given a set of classes, but I'm looking for a library that works in r...
I'm using Jinja2, and I'm trying to create a couple tags that work together, such that if I have a template that looks something like this: {{ my_summary() }} ... arbitrary HTML ... {{ my_values('Tom', 'Dick', 'Harry') }} ... arbitrary HTML ... {{ my_values('Fred', 'Barney') }} I'd end up with the following: This page includes inform...
When my script sleeps for 50sec my IDE locks up which is very annoying. I cant switch tabs, look through my source, type code, etc. It happens in pylde and pyscripter, i havent tried other IDEs. What can i do to fix this? i'm actually doing for i in range(0, timeInSeconds): time.sleep(1) hoping the IDE will update once per second but...
I want to fetch data from a mysql database using sqlalchemy and use the data in a different class.. Basically I fetch a row at a time, use the data, fetch another row, use the data and so on.. I am running into some problem doing this.. Basically, how do I output data a row at a time from mysql data?.. I have looked into all tutorials ...
I love how in python I can do something like: points = [] for line in open("data.txt"): a,b,c = map(float, line.split(',')) points += [(a,b,c)] Basically it's reading a list of lines where each one represents a point in 3D space, the point is represented as three numbers separated by commas How can this be done in C++ without...
I'm working on a grid system which has a number of very powerful computers. These can be used to execute python functions very quickly. My users have a number of python functions which take a long time to calculate on workstations, ideally they would like to be able to call some functions on a remote powerful server, but have it appear t...
What is the most elegant method for dumping a list in python into an sqlite3 DB as binary data (i.e., a BLOB cell)? data = [ 0, 1, 2, 3, 4, 5 ] # now write this to db as binary data # 0000 0000 # 0000 0001 # ... # 0000 0101 ...
When programming in Python, is it possible to reserve memory for a list that will be populated with a known number of items, so that the list will not be reallocated several times while building it? I've looked through the docs for a Python list type, and have not found anything that seems to do this. However, this type of list buildin...
Maybe i cant do what i want? I want to have 1 thread do w/e it wants and a 2nd thread to recv user input to set the quit flag. using this code i want to enter q anytime to quit or have it timeout after printing hey 6 times import sys import threading import time class MyThread ( threading.Thread ): def run (s): try: ...
I've been told wsgi is the way to go and not mod_python. But more specifically, how would you set up your multi website server environment? Choice of web server, etc? ...
Hi, this is going to sound pretty ignorant, but: I was working a bit in the python interpreter (python 2.4 on RHEL 5.3), and suddenly found myself in what seems to be a 'vi command mode'. That is, I can edit previous commands with typical vi key bindings, going left with h, deleting with x... I love it - the only thing is, I don't know...