The following code: is giving me this error: Any explanations, as to why this is happening, and guidance to how such a thing could be achieved? Answer This is because you are trying to access bar from the FooBar class rather than a FooBar instance. The FooBar class does not have any bar objects associated wit…
Tag: python
TypeError: ObjectId(”) is not JSON serializable
My response back from MongoDB after querying an aggregated function on document using Python, It returns valid response and i can print it but can not return it. Error: Print: But When i try to return: It is RESTfull call: db is well connected and collection is there too and I got back valid expected result b…
Python’s equivalent of .Net’s sealed class
Does python have anything similar to a sealed class? I believe it’s also known as final class, in java. In other words, in python, can we mark a class so it can never be inherited or expanded upon? Did python ever considered having such a feature? Why? Disclaimers Actually trying to understand why seale…
Output pyodbc cursor results as python dictionary
How do I serialize pyodbc cursor output (from .fetchone, .fetchmany or .fetchall) as a Python dictionary? I’m using bottlepy and need to return dict so it can return it as JSON. Answer If you don’t know columns ahead of time, use Cursor.description to build a list of column names and zip with each…
Datamatrix code generation with python
I need to “encode” a string into a Datamatrix code image, and am struggling the whole day to find a way (library) to do it. Does anyone know a good python library for Datamatrix code generation? Or a way to do it?” Thanks! Answer Elaphe library for barcode generation has datamatrix support. …
draw a circle over image opencv
Im usign python and opencv to get a image from the webcam, and I want to know how to draw a circle over my image, just a simple green circle with transparent fill my code: Thanks in advance. Answer Use “thickness” parameter for only the border.
sqlalchemy OperationalError: (OperationalError) (1045, “Access denied for user
I am trying to create a remote database using mysql on an Ubuntu machine running 12.04. It has a root user with remote login enabled.I have started the server. output of shows From the client machine that also runs Ubuntu 12.04 I use a python script to connect to the remote mysql database using sqlalchemy. Th…
‘dict’ object has no attribute ‘loads’
Im trying to create a simple key/value store client that accepts input from a text file like this This is the error I am getting I currently have the whole thing in a for loop to call the url for each new command but I’m having issues with any input file larger than 1 line. Here is my source, i’m
Pandas: Setting no. of max rows
I have a problem viewing the following DataFrame: The problem is that it does not print all rows per default in ipython notebook, but I have to slice to view the resulting rows. Even the following option does not change the output: Does anyone know how to display the whole array? Answer Set display.max_rows: …
Why does Tkinter image not show up if created in a function?
This code works: It shows me the image. Now, this code compiles but it doesn’t show me the image, and I don’t know why, because it’s the same code, in a class: Answer The variable photo is a local variable which gets garbage collected after the class is instantiated. Save a reference to the …