How to wrapper built-in list in python? Question: I want to define a class ListWrapper that has all list behaviors and also has a filter method. It should work like this: ls = [1, 2, 3, 4, 5] ls = ListWrapper(ls) ls.filter(lambda x: True if x % 2 == 0 else False) print(ls) # out: …
Why can't I pass a decorated function to scipy.integrate.ode? Question: When I pass a decorated function to scipy.integrate.ode, the wrapper function gets called, but *args is empty. Why is this happening? This works: y0, t0 = 1, 0 def dydt(t, y): return y*0.5 r = scipy.integrate.ode(dydt) r.set_initial_value(y0) r.integrate(10) assert r.successful() This doesn’t: y0, t0 = …
Python – create wrapper function for SQL queries Question: In my project I have lots of functions that carry out SQL queries. These queries include SELECT, UPDATE, INSERT etc… When writing functions for SELECT queries for example, I write the same structure of code in every single function. e.g. def generic_select_function(self): result = self.cursor.execute(""" SQL …
How can I dynamically extend arguments of a method? Question: The methods should be callable by assigning the specific parameters as well as considering the class’ attributes. So what I like to achieve is overwriting a method’s arguments with preset attributes. E.g.: class Obj: def __init__(self, cfg=None): self.cfg = {} if cfg: self.cfg = cfg …
How do I use line_profiler on a wrapped function? Question: I’ve been trying to use line_profiler on a wrapped function. However, the wrapper function gets profiled instead of the wrapped function. The executable snippet below shows that I can see that my @decorate wrapper function gets profiled instead of my d() function. Snippet: testy_profiler.py from …
How to convert a generator of objects to a generator of a single property of each object? Question: Suppose an api returns a python generator that yields Person objects # Example person class # p = Person() # p.name = "Jane Doe" # p.age = 25 people = api.get_people() # returns generator for person in …
python decorate function call Question: Is it possible to wrap a function call using python decorators? I don’t want to implement a wrapper for every function of a module individually. I would like to have something like def a(num): return num @double_the_value a(2) returning 4 without the need of having access to the implementation of …
How to create a Python wrapper for a DLL library Question: I am trying to take a provided DLL file from a software SDK and create a python wrapper so to integrate it with the rest of my code base. I have followed quite a few guides online, and still having no luck. The current …
Exposing `defaultdict` as a regular `dict` Question: I am using defaultdict(set) to populate an internal mapping in a very large data structure. After it’s populated, the whole structure (including the mapping) is exposed to the client code. At that point, I don’t want anyone modifying the mapping. And nobody does, intentionally. But sometimes, client code …
How to wrap every method of a class? Question: I’d like to wrap every method of a particular class in python, and I’d like to do so by editing the code of the class minimally. How should I go about this? Asked By: rjkaplan || Source Answers: You mean programatically set a wrapper to methods …
