I have this code for delete operation on a Postgresql DB: The create and read operations work fine. If I pass an existing or a non-exsiting id to delete, I get a 500 Internal Server error. The row does get deleted from the table though. If I comment this line deleted_post = cursor.fetchone(), it works okay. Here is the error
Trying to add a field to Django many-to-many relation
Right now I’m working on a Django project responsible for the warehouse management system. I got products, customers, warehouse branches, product types, orders, etc… products can be [Milk 1L bottle, cheese 500g pack, ….] The problem I have been facing is that I’m trying to make a many-to-many relationship between orders and products so I can track the products sold
Length key in dictonary
How can I find out the length of the values of the key? I have code: It gives me: key : … (not length and count) And should: How should I do it? Answer There are three problems with your code: __len__ is a method, not an attribute. You get the length of an iterable using the len function: Docs
count number of missing items required comparing dictionaries in python
Given a list: a dictionary with ingredients I currently have: and a more complex dictionary with the recipes and items per ingredients: I want to output a dictionary that adds to the elements of the list list_essentials the number of items I need if I wanted to be able to make all the recipes. The expected output I am looking
How to visualize Classification using pandas and matplotlib?
I’m trying to classify a dataset using python with pandas. The iris flower dataset consists of 50 samples from each of three species of Iris and contains four features.The goal is to distiguish between the species of irises based on these features. Question: Generate a scatter plot with sepal_length feature in x-axis and petal_width feature in y-axis, which shows the
What does NameError mean in python? [closed]
Closed. This question needs debugging details. It is not currently accepting answers. Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question. Closed last month. Improve this question I cannot get where my error is in my code. When I try to
Passing command to the called script [closed]
Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers. Closed last month. Improve this question I
How to replace irrelevant data into mean values?
Let’s say I have 600,000 data points in column for age. In the data there are values 0 and -1, which is not relevant for age. How can I change both 0 and -1 values in my data to the column mean value using python? The code so far: Answer You can find the mean separatly and then use the
can’t put variables inside sqlite3 query in flask
Like documentation says, and I tried: it didn’t work, and I tried: also didn’t work. How can I pass variables inside my request? Answer The insertion looks correct. However, until you perform a commit, any DML operation (like an insert) would only be visible from the session that performed it, and will implicitly be rolled back when the connection is
Trying to type ‘→’ with keyboard module
I am making a program that writes a program in TI-Basic. In TI-Basic, to set a variable, the syntax is value → varname. The TI-Connect software doesn’t like it when I copy-paste, so I’m using the keyboard module to simulate keypresses. I can’t manually type the program as it is about 850 lines long. When I try to run the