I ran the following code a while ago and it worked but now there is the following error. How to solve it? ValueError: protocol not known. Answer As far as I could debug this issue is caused by an update of pandas. The 1.1.0 update had changed few things on the read_json function. I could make my code work whe…
Using primitive operators to find factorial of N up to K depth
Having difficulty coming up with a solution using: iteration/control-flow and accumulation. More than just a solution, would prefer having an answer with hints and explanation. Answer Ignoring k=0 you have want to multiply k numbers starting with n and ending with n-k. The above loops k times and since i will…
Calling an attribute defined in a method from another method in data science (python)
I’m learning object oriented programing in a data science context. I want to understand what good practice is in terms of writing methods within a class that relate to one another. When I run my code: I get the following output (only part of the output is shown due to space constrains): I am happy with …
Pandas merge 3 dataframes with same columns
I have 3 dataframes where I have one string column which I want to merge on and 2 similar columns which I want to add up df1: df2: df3: I want: df4: Answer try this, first pandas.concat then groupby
Django ModelForm has no model class specified, Although model in Meta class is set to a model
Error is “ModelForm has no model class specified.” forms.py code models.py code views.py code The error is occurs when I’m trying to create a new user form (user_form = UserForm()). Although in my meta class I set models to the User model imported from django.contrib.auth.models. Error Info …
AWS lambda expected intended block error in Python
I am following the below document to connect to Cloudwatch logs to ELK. https://medium.com/@sohit_kumar/streaming-aws-cloudwatch-logs-to-your-own-elk-logging-solution-2bbd32f25100 I get a “expected an indented block” syntax error in python for this line. try: logs = awslogs_handler(s, event) Can s…
How to get feature names for a glove vectors
Countvectorizer has feature names, like this. What would be the feature names for a glove vector? How to get those feature names? I have the glove vector file of 300 dimensions like the above shown. What would be the name of the 300 dimensions of the glove vectors? Answer There is no name for the Glove featur…
Django: def save() in models.py
I’m trying to add the save-function inside my models.py, but it seems I’m doing something wrong. The user has to type the first- and last-name. Without him or her entering any more data, another field inside my models.py should be filled with a combination from these fields. models.py: Is this eve…
Warning – variable referenced before assignment
Having the following snippet: I get a Pycharm warning Local variable cache_data might be used before assignment. Could you please explain how this could possibly happen in this case or is this an inspection bug? Answer Unfortunately this seems to be a known issue in PyCharm that was reported back in Nov 2019.…
Empty dataframe when filtering
I have a dataframe that looks like this: Now I’d like to filter like this: However, I am getting an empty dataframe. What am I doing wrong here? Answer Try df1.loc[df1[‘PZAE’]==”‘HAE’”] Details : the column ‘PZAE’ contains str starting and finishing by ‘ t…