I am currently reviewing the python tutorials of python.org. I come from C++ and in the Classes tutorial (https://docs.python.org/3/tutorial/classes.html) I see that the scoping is similar to that in C++. It says the following about scoping and nesting: “At any time during execution, there are at least …
Tag: python
OpenCV Python: How to overlay an image into the centre of another image
How can I paste a smaller image into the center of another image? Both images have the same height, but the smaller one has a width that is always smaller. The resulting image should be the smaller image with black bars around it so it is square. resizedImg blankImg Answer Here is one way. You compute the off…
Django Unit Test – IDs of created objects
Sample models.py models.py Suppose that I have written unit test/s: I was wondering if it’s safe to assume that the id’s of the created objects in setUp() method will always start at id 1 and so on and so forth? If not, is there a specific reason why if the test database is always destroyed after …
boto3 s3 Object expiration “MalformedXML” error
I’m trying to set the lifecycle configuration of a subdirectory in Amazon S3 bucket by using boto3 put_bucket_lifecycle_configuration. I used this code from aws documentation as referece: I removed Transitions and added Expiration, to better fit my purpouses. Here is my code: The error I’m receivi…
Numba cannot determine fingerprint of empty list even with signature
I am using the @jit signature to define the types of the incoming arguments. But in calling the function I get: I know the list is empty, but my signature defines it so am not sure why Numba does not use that signature. I have tried the different forms of signatures (string form and the tuple form) and it sti…
ModuleNotFoundError: No module named ‘sympy’
I’m on MacOSX Mojave 10.14.6 on a MacBook Pro 2015. So I pip installed sympy, right? I head over to my shell, run python3, and do: Just to be sure, I pip installed again just to make sure. My pip list also includes sympy as sympy 1.4. What’s wrong here? Is there another setup step I’ve misse…
Annotate 3D scatter plot on pick event
I want to show annotations on a 3D scatter plot when the user clicks on a point. The code I have shows the annotation once I move the plot after I click on a point. How can I make the annotation appear as soon as the user clicks on a point, without having to move the plot? Answer Add fig.canvas.draw_idle()
How to reverse Label Encoder from sklearn for multiple columns?
I would like to use the inverse_transform function for LabelEncoder on multiple columns. This is the code I use for more than one columns when applying LabelEncoder on a dataframe: Is there a way to modify the code and change it so that it be used to inverse the labels from the encoder? Thanks Answer In order…
Get total amount of free GPU memory and available using pytorch
I’m using google colab free Gpu’s for experimentation and wanted to know how much GPU Memory available to play around, torch.cuda.memory_allocated() returns the current GPU memory occupied, but how do we determine total available memory using PyTorch. Answer In the recent version of PyTorch you ca…
Match non-capturing group multiple times
I tried really hard to make a good title, but I’m not sure if I’m asking this right. Here’s my best attempt: I’m using Python’s flavor of regex I need to match numbers using named groups: but should not match: my best attempt so far has been: I’m using [sa-z] instead of a w…