Everywhere, I can easily find an example about writing a method with Python C Extensions and use it in Python. Like this one: Python 3 extension example How to do write a hello word full featured Python class (not just a module method)? I think this How to wrap a C++ object using pure Python Extension API (py…
Tag: python
How can I extract multiple .zip files?
I’m trying to extract multiple files from some .zip archives. My code is: However, it only extracts the files inside the first archive. I’m using Python 3.6. What is wrong? Answer I thought this scenario might be a serious candidate … What happens is that for each .zip file, all its members …
How do I access a model’s nested one-to-many relations?
I have three models as shown below: A restaurant has many menu categories, which has many menu items. Is this the right way to lay out these relationships? What’s the most efficient way to get ALL the menu items for a given restaurant? I’m hoping there’s a more effective way than to loop acr…
How to replace values in pandas data frame by dictionary?
I have a problem with pandas and replacing values. I have a table with animals and their alleles looks that: And I need to change values of Top1 and Top2 by a specific Key for each row. For example: if values in same rows will be = C & A, I will replace it to A & B, if row
Create pandas series using a dictionary as mapper
Is there a built-in function to create a pandas.Series column using a dictionary as mapper and index levels in the data frame ? The idea is to create a new column based on values in index levels and a dictionary. For instance: Let’s suppose the following data frame, where id, name and code and different…
Python custom function for sorting a list of objects
A list of Point class objects is given. The Point class is as follows: The goal is to sort the list by the value attribute provided that if two objects have the same value attributes, the object whose is_start value is True should go before the object whose is_start value is False. An example of input: I̵…
How do I write a function to run a function and return uniquely named outer-scope variables?
I need to run one function multiple times where 3 out of 5 arguments stay the same every time. How can I write a function to just take the unique arguments as inputs and return the outputs of the inner function as unique variables? The function I’m trying to run is part of SQLalchemy: The first argument…
Can I use Redis installed on Windows Subsystem for Linux with a python app in Windows?
I would like to develop a python application on Windows that will use Redis as a broker for Celery. Is it correct to assume that my application can interact with an instance of Redis that I have installed on the Windows Subsystem for Linux? I have enabled the Windows Subsystem for Linux on Windows 10, and ins…
How to cycle the NaNs in pandas dataframe rows?
I have a dataframe like this: How to put all the NAs in the left instead of right? Required: Answer There are mixed numeric with strings rows, so solution is use sorted with key parameter in DataFrame.apply: If all values are numeric, faster solution is with justify:
Import function from submodule in __init__.py without exposing submodule
I’ working on a Python project with a directory structure similar to this: Where the module bar1 defines the function function1. I would like to have users of my code import function1 (and nothing else) directly from foo, i.e. via from foo import function1. Fair enough, that can be achieved with the fol…