Answer i is defined twice in your nested loop, the 2nd i will overwrite the first. Rename one of them to avoid this. Also, .add should be .append and range(len(self.z)) should probably be range(self.y) in order to have the correct number of columns. Side note: why is __init__ returning a value?
Tag: class
python assign attribute names and his values with a dictionary passed to the class
The normal way to pass a variable to a class atrubte is as follows: It is a convention to call the variable inside the init the same as the attribute. I could have done: Now imagine I would like to pass to the init method a dictionary with the name of the attributes and the values they should take. I
Selenium on Python unable to locate nested class element
I’m trying to reach a nested class, originally I used xPath but it returned an empty list, so I went through the classes individually, and one of them has an issue where selenium can’t find it. Up until Price4 it works fine, but it can’t seem to find Price5 Answer So, if you want to get the …
Python: Construct class (and variable names) through a function?
I recently started to work with Python’s classes, since I need to work with it through the use of OTree, a Python framework used for online experiment. In one file, I define the pages that I want to be created, using classes. So essentially, in the OTree system, each class corresponds to a new page. The…
class and defining __str__
This is the exercise: Write the special method __str__() for CarRecord. Sample output with input: 2009 ‘ABC321’ Year: 2009, VIN: ABC321 The following code is what I have came up with, but I’m receiving an error: TYPEERROR: __str__ returned non-string I can’t figure out where I went wro…
Python best practices — can I set an object attribute to call a class method?
I am building a tool to query all DNS records for a hostname. Each hostname will create a ScanObject object, which will call another module to do the queries upon instantiation. I create class methods so that I can just pull records I need instead of all the records. Therefore, these methods need to refer to …
Python: Function scope inside a class
Let’s consider the code below. On first look, one might expect list_1 and list_2 to both have the same content: [“Tom”, “Tom”], but this is not the case. list_1 evaluates to [“Tom”, “Tom”], whereas list_2 evaluates to [“John”, “John”…
How does the statement for creating classes work in Python?
When I create a class Test defining one method “a”, a object Test, whose type is type ,is created. The dir function give-us the names of the attributes/methods of an object. But when I code: I get: from where did this “a” come from? I thought “a” would be a method from a ob…
Is it a mandatory to have two classes(Node,Tree) while implementing a binary tree?
This may sound silly but trust me , I have searched for various articles online and could not find a proper explanation or no explanation at all , Does it really need two classes one for Node and one for tree to implement binary tree? for Instance , let’s take a simple python code : this is bascially wh…
Return value from function within a class using multiprocessing
I have following piece of codes, which I want to run through multiprocessing, I wonder how can I get return values after parallel processing is finished. I prefer not to make any change to getdata function. Output: Answer The Calculation objects you create in your main process are copied into the spawned proc…