I’m taking a first look at the python language from Python wikibook. For sets the following is mentioned: We can also have a loop move over each of the items in a set. However, since sets are unordered, it is undefined which order the iteration will follow. and the code example given is : Output: When I…
Tag: python
Easiest way to include a stop parameter in enumerate python?
Ss there a simple way to iterate over an iterable object that allows the specification of an end point, say -1, as well as the start point in enumerate. e.g. So if my object has a length of 10, what is the simplest way to to get it to start iterating at index 2 and stop iterating at index 9?
pop/remove items out of a python tuple
I am not sure if I can make myself clear but will try. I have a tuple in python which I go through as follows (see code below). While going through it, I maintain a counter (let’s call it ‘n’) and ‘pop’ items that meet a certain condition. Now of course once I pop the first item,…
Sort dictionary by the INT value of the value
There are many posts here about sorting dictionaries in Python so I was careful to read them and hope this is not a duplicate: I’m using a dictionary to hold words as keys and the occurrence of the word as value. This leads to a dictionary that could be like: I want to sort them by occurrence (the ̵…
Python ‘list indices must be integers, not tuple”
I have been banging my head against this for two days now. I am new to python and programming so the other examples of this type of error have not helped me to much. I am reading through the documentation for lists and tuples, but haven’t found anything that helps. Any pointer would be much appreciated.…
Why is my Project Euler problem #1 code returning the wrong result?
Problem 1 Project Euler, which asks you to find the sum of all multiples of 3 or 5 below 1000, so 3 + 5 + 6 + 9, etc. The correct answer is 233168 but my code is returning 266333. I’m not looking to use a different method, I’m wondering why this code isn’t working as is, from the debugging
Python DNS module import error
I have been using python dns module.I was trying to use it on a new Linux installation but the module is not getting loaded. I have tried to clean up and install but the installation does not seem to be working. $ python –version Python 2.7.3 $ sudo pip install dnspython Downloading/unpacking dnspython …
RuntimeWarning: divide by zero encountered in log
I am using numpy.log10 to calculate the log of an array of probability values. There are some zeros in the array, and I am trying to get around it using However, RuntimeWarning: divide by zero encountered in log10 still appeared and I am sure it is this line caused the warning. Although my problem is solved, …
How does one convert a grayscale image to RGB in OpenCV (Python)?
I’m learning image processing using OpenCV for a realtime application. I did some thresholding on an image and want to label the contours in green, but they aren’t showing up in green because my image is in black and white. Early in the program I used gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)…
How to decorate a parent class and make child classes use it? python
What I want is to create a class decorator to decorate a class and works on subclasses too. Imagine this class: and the real Test: what I want is to use a decorator in CustomBaseTest that finds all methods that starts with ‘decoratte_this_’ and execute custom code after and before. I already have …