I have a simple python function that needs tested that looks like this: However, to test this, I don’t want to test with a real table – I would like to create a Mock schema within my test (and a mock client too). My test currently looks like this: However, when I print returned_schema, I get the f…
Tag: python
Summation of a product of a function and a vector in Sympy
I want to use the following expression in sympy. For example I tried this sympy code, but an error has occurred. How can I manage this? (How to use Symbol’s value as an index of Matrix?) Answer You can use symbolic indices with a matrix but you need to use double indices:
Flask-SQLAlchemy db.create_all() raises RuntimeError working outside of application context
I recently updated Flask-SQLAlchemy, and now db.create_all is raising RuntimeError: working outside of application context. How do I call create_all? This raises the following error: Answer As of Flask-SQLAlchemy 3.0, all access to db.engine (and db.session) requires an active Flask application context. db.cr…
How to disable python rounding?
I’m looking for a way to disable this: print(0+1e-20) returns 1e-20, but print(1+1e-20) returns 1.0 I want it to return something like 1+1e-20. I need it because of this problem: returns f1 is the original function, f2 is f1 shifted by 1 to the left and f3 is f2 moved back by 1 to the right. By this log…
How to avoid dummy clases during multiple inheritance with conditions
Is it possible to refactor multiinheritance without dummy classes? Maybe anybody have similar issue or have experienxe to tackle it, or at least tell me which way to look?? Code from __init__.py Answer It is relatively easy to create a type dynamically in python. For example:
Using Pandas df.loc
I have a DataFrame of a csv file which is being read by pandas. What I am attempting to do is use df.loc to add a new column but only insert values into the column when values from another column, called “SKU” end with “-RF” and “-NEW”. The code I was working on is below. I…
Substitute numbers in a list of type object pandas
I have a dataframe df looking as follows: What I would like to do is to substitute into df[‘cited_ids’] 0 whenever the corresponding id has d=0 (i) and replace d=1 if there is at least one 0 in the list of df[‘cited_ids’] and the previous d was not 0 (ii). In other words, the first ste…
sum multiple list elements at the same time(python)
How can I sum multiple list elements at the same time? For example, something like this in Python: Our lists (input): Output: Note: we don’t know how many list will be given to us. Answer This should do the job
Applying function to Column AttributeError: ‘int’ object has no attribute
I have a pandas data frame that consists of special/vanity numbers. I would like to add a column to classify each number based on its pattern using regex. I have written a function that iterates through the column MNM_MOBILE_NUMBER. Identifies the pattern of each number using regex. Then, creates a new column…
Pandas take number out string
In my data, I have this column “price_range”. Dummy dataset: I am using pandas. What is the most efficient way to get the upper and lower bound of the price range in seperate columns? Answer Alternatively, you can parse the string accordingly (if you want to limits for each row, rather than the to…