I am new in python and pandas and also in stackoverflow so I apologize for any mistakes I make in advance. I have this dataframe output is and my desired outcome is to have something like in below I have this code from another topic link But it does not take “interval_start” into consideration, I …
REST API: How to prevent “An existing connection was forcibly closed by the remote host”
Following this thread, https://stackoverflow.com/a/2582070/6534818, I am wondering if there is any room for improvement to my REST API query that would limit the frequency to which I receive the following error: “An existing connection was forcibly closed by the remote host”. The thread suggests, …
matplotlib.pyplot.clim counterpart in pyqtgraph
I want to apply a colormap (“hot”) only to a certain range of values of an image. I already know this functionality from matplotlib.pyplot.clim where you have to specify a minimum and a maximum value for the scaling. As I understood it, you should use setLevels([min,max]) for this. I have included…
Replace cv2.warpPerspective for big images
I use python OpenCV to register images, and once I’ve found the homography matrix H, I use cv2.warpPerspective to compute final the transformation. However, it seems that cv2.warpPerspective is limited to short encoding for performance purposes, see here. I didn’t some test, and indeed the limit o…
Python List Comprehension to Delete Dict in List
I have a json file formatted as above and I am trying to have a function delete an entry based on the username input from a user. I want the file to then be overwritten with the entry removed. I have tried this: It partially works as everything in the Credentials section looks normal, but it appends a strange…
merge columns in numpy matrix
I have a NumPy matrix like this one (it could have several columns, this is just an example: I need to merge all columns in this matrix, replacing nan values with the corresponding non-nan value (if exists). Example output: Is there a way to achieve this with some built-in function in NumPy? EDIT: if there is…
Django – Retrieve all manytomany field objects related to a specific model
I have my models reviews and news, both having a manytomany relation with Category model. Now I want to get all the categories associated with only one of these two models. For example, to get all categories associated with News model, I tried querying database with News.categories.all() but got AttributeErro…
How to draw a line between a data point and an axis in matplotlib?
Using matplotlib one can use: plt.hlines/vlines to draw segments (e.g. between two data points) plt.axhline/axvline to draw lines relative to the axes My question is: what is the simplest way to do half of each? Typically, drawing a segment from a datapoint to its coordinate on the x or y axis. Answer In my o…
Dropping rows at specific minutes
I am trying to drop rows at specific minutes ( 05,10, 20 ) I have datetime as an index Then I run below it returnes invalid syntax error. Answer You can just do it using boolean indexing, assuming that the index is already parsed as datetime. Or the opposite of the same answer:
“parameter ‘self’ unfilled” when using decorators, even after instantiating object
I’m using a decorator with parameters to do something with an instance attribute (self.x in this example, if track_bool is true). However when running I get the “parameter ‘self’ unfilled” error when calling b.do(). From what I understand this error is supposed to appear when cal…