Python Error: “ValueError: need more than 1 value to unpack”
Each Answer to this Q is separated by one/two green lines. In Python, when I run this code: from sys import argv script, user_name =argv prompt=”>” print “Hi %s, I’m the %s script.” %...
Plotting a decision boundary separating 2 classes using Matplotlib’s pyplot
Each Answer to this Q is separated by one/two green lines. I could really use a tip to help me plotting a decision boundary to separate to classes of data. I created some sample...
How to combine Celery with asyncio?
Each Answer to this Q is separated by one/two green lines. How can I create a wrapper that makes celery tasks look like asyncio.Task? Or is there a better way to integrate Celery with...
What is a PyObject in Python?
Each Answer to this Q is separated by one/two green lines. Short version I recently came across some Python code in which the return type for a function was specified as PyObject in the...
Ceil and floor equivalent in Python 3 without Math module?
Each Answer to this Q is separated by one/two green lines. I need to ceil and floor 3/2 result (1.5) without using import math. math.floor(3/2) => 3//2 math.ceil(3/2) => ? OK, here is the...
Django: change the value of a field for all objects in a queryset
Each Answer to this Q is separated by one/two green lines. I have a model MyModel with a boolean field active Elsewhere, I am retrieving a queryset: qs = MyModel.Objects.filter(….) how can I set...
Get number of modified rows after sqlite3 execute in Python
Each Answer to this Q is separated by one/two green lines. When performing SQL statements such as UPDATE, and INSERT, the usual .fetch*() methods on the Cursor instance obviously don’t apply to the number...
Concatenate two NumPy arrays vertically
Each Answer to this Q is separated by one/two green lines. I tried the following: >>> a = np.array([1,2,3]) >>> b = np.array([4,5,6]) >>> np.concatenate((a,b), axis=0) array([1, 2, 3, 4, 5, 6]) >>> np.concatenate((a,b),...
pytest using fixtures as arguments in parametrize
Each Answer to this Q is separated by one/two green lines. I would like to use fixtures as arguments of pytest.mark.parametrize or something that would have the same results. For example: import pytest import...
How to exit a program: sys.stderr.write() or print
Each Answer to this Q is separated by one/two green lines. I am writing a small app and I need to quit the program multiple number of times. Should I use: sys.stderr.write(‘Ok quitting’)sys.exit(1) Or...