subclassing dict; dict.update returns incorrrect value – python bug?

I needed to make a class that extended dict and ran into an interesting problem illustrated by the dumb example in the image below. Why is d.update() ignoring the class’s __getitem__? EDIT: This is …

Closing a Panda3d app without shutting down the whole Process

wrote a small application which is composed of a QT GUI module which in turn initiate an object that inherits from ShowBase class. Problem is, if I close the Panda App, the ShowBase class calls …

Module imports and __init__.py

I am trying to understand what the best practices are with regards to Python’s (v2.7) import mechanics. I have a project that has started to grow a bit and lets say my code is organised as follows: …

How to set a variable from inside a for loop that can be accessed from outside the for loop [Jinja]

When a user clicks a link, I want Jinja to set a variable called {{ contact_clicked }} that is equal to {{ contact }}. I could do …..</…

How to specify what actually happens when Yes/No is clicked with ctypes MessageBoxW?

def addnewunit(title, text, style): ctypes.windll.user32.MessageBoxW(0, text, title, style) Ive seen a lot of people show this code, however nobody has ever specified how to actually make the Yes/…

Using multiple Python engines (32Bit/64bit and 2.7/3.5)

I would like to use Python for scientific applications and after some research decided that I will use Anaconda as it comes bundled with loads of packages and add new modules using conda install …

How to download a file over HTTP with multi-thread (asynchronous download) using Python 2.7

I have a file to download (download path extracted from json. eg: http://testsite/abc.zip). I need a help to perform, all the 5 threads should download the abc.zip file to the output directory and the download has to be Asynchronous or concurrent. Currently with the below code it does download the file 5 times but it downloads one by one (Synchronous). What I want is, the download to be simultaneous. I have read Requests with multiple connections post and it’s helpful, but doesn’t address the requirement of the question asked. Answer I use threading module for download threads: Also requests, but

Python for and if on one line

I have a issue with python. I make a simple list: I want create a “single line code” for find a string. for example, I have this code: But when I watch the variable is wrong (I find the last value of my list): Why does my variable contain the last element and not the element that I want to find? Answer You are producing a filtered list by using a list comprehension. i is still being bound to each and every element of that list, and the last element is still ‘three’, even if it was subsequently filtered out

Why round off of 0.500000 in python differs from 45.500000 using ‘%.0f’?

Recently, I learned art of string formatting in Python 2.7. I decided to play with floating point numbers. Came across an awkward looking solution, as written below. print “%.0f”%45.5000000 #46 …

Control wsgiref simple_server log

I’m playing with wsgiref.simple_server to study the world of web servers. I would like to control the log generated, but could not find anything about it in Python’s documentation. My code looks like this: Answer wsgiref.simple_server.make_server by default creates a WSGIServer with WSGIRequestHandler: WSGIRequestHandler here extends from BaseHTTPServer.BaseHTTPRequestHandler, where the logging magic turns out to be: So it’s logging to stderr, actually, not to python logging module. You can override this in your own handler: And pass your custom handler to the server instead: