I’m trying to call C++ function using ctypes. The function declaration looks like As Python can not interact with C++ directly, I have created a C-wrapper for this function as follows And Python wrapper But when I try to call Python wrapper with some bytes passed as param, for example It fails with the …
Change pandas dataframe content in a function
I’m writing a class that does one hot encoding, but it doesn’t work as I expected. On my main code I have this: The class method is the following: Now, with print(data.columns) I can see that the method works correctly, but when train_x_categorical.head() runs I can’t see the effect of the m…
Using DataFrame cross join throw no common columns to perform merge on
I’d like to create a third column as a result of a cross join between my Columns A and B: They have the following unique values: I’d like to have a df[‘C’] with the combination of all cross joins, thus we should have 6 * 4 = 24 unique values in it: Thus we should have the following: Us…
3d numpy array perform operation along column i only
I have a 3d numpy array like this (as an example) I want to apply the following operations only to elements within the column with index 1 in the inner dimension. The elements are [-2,6,10,14] for the example above. The operations would be: Can someone help me? I have looked into several NumPy methods but can…
Extract data from json in these format
I’ve been messing around with JSON for some time, just pushing it out as text and it hasn’t hurt anybody (that I know of), but I’d like to start doing things properly. this is my code : this is my json file: my output is these: I want output like in these format as you have shown in the pic
Confuse why my KNN code is throwing a ValueError
I am using sklearn for KNN regressor: I get this error message: Could someone please explain this? My data is in the hundred thousands for target and the thousands for input. And there is no blanks in the data. Answer Before answering the question, Let me refactor the code. You are using a dataframe so you ca…
pydantic.error_wrappers.ValidationError: 11 validation errors for For Trip type=value_error.missing
Im getting this error with my pydantic schema, but oddly it is generating the object correctly, and sending it to the SQLAlchemy models, then it suddenly throws error for all elements in the model. i must say that all the fields should have values. And the error trace do not references any part of my code so …
how to count data in a certain column in python(pandas)?
hope you’re doing well . i tried counting green color row after another green colored row in the table below In [1]: df = pd.DataFrame([[green], [red], [red]], columns=[‘A’]) the code i tried to count greengreen: but it didn’t work,hope you can help. note: i’m new to data science…
beautifulsoup Case Insensitive?
I was reading: Is it possible for BeautifulSoup to work in a case-insensitive manner? But it’s not what I actually needed, I’m looking for all img tags in webpage, which include: IMG, Img etc… This code: Will only look for img tags case sensitive so how can I solve this problem without addin…
Creating adjacency matrix from sparse SKU data in Python
I have ecommerce data with about 6000 SKUs and 250,000 obs. Simple version below but a lot more sparse. There is only one SKU per line as each line is a transaction. What I have: I want to create a weighted undirected adjacency matrix so that I can do some graph analysis on the market baskets. It would look l…