Questions tagged [python-3.x]

Python 3 is the latest version of the Python programming language and was formally released on December 3rd, 2008.

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23 views

Sync image files from network with mariadb-Database

i have as a mechanical engineering student in my practice semester to create a database that includes about 100k+ paths to images in our network. Every, lets say week, i have to synchronize all ...
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8answers
6k views

Is using lambdas to express intent not pythonic?

PEP 8 states the following about using anonymous functions (lambdas) Always use a def statement instead of an assignment statement that binds a lambda expression directly to an identifier: # Correct: ...
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Configuration file handling in ORM libraries

I maintain several ORM libraries written in Python 3 using peewee. In order to use the ORM models, i.e. operate on the database through them, the database object needs to be configured with the ...
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1answer
96 views

designing high throughout system for storing hundred thousands incoming records per second in SQL server database

In our company we have a requirement where we would like to store hundred thousands incoming records per seconds. we currently a pub-sub model for processing many records(100/sec) from many system(~...
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1answer
85 views

legacy refactor and churn

I am trying to work on finding the following metrics New Work - totally new code which does not replace other code. Churn - code that is rewritten or deleted after being written Help Others - where ...
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57 views

Proper way to implement AWS Cognito

I am trying to implement AWS Cognito with Chalice. I understand that ID Token is to identify the user (authenticate), Access Token is to authorize to run operations on resources, and Refresh token is ...
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8 views

Python Banking Transfers Systems Backend

I'm wondering how banks that use cards with chips for their transfers, actually recieve the information (like if the banks backend was written in python, how would the data be recieved, in a json ...
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3answers
257 views

"Hard coded" vs. configuration files for values in libraries? (code organization question)

I'm trying to get a good understanding as to whether there is a best practice or standard regarding keeping values within your code libraries or referencing them from another config file. I don't ...
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1answer
73 views

In a language interpreted line by line - is optimizing similar lines of code within a module into functions better in terms of efficiency? [duplicate]

While writing python code (I write python-selenium for GUI automation), I am facing situations wheer I have to deal with 5 widgets that do the same thing, just there xpath is differs by one term. # ...
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1answer
59 views

How to design "define-by-run" API?

I am amazed by the way APIs of some machine learning packages are designed, namely Chainer's and Pytorch's "define-by-run" API. Even Optuna, a hyper parameter tuning library has "define-...
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2answers
312 views

Alternative to using regex in Python

Background I do programming with Python and now and then i run into a situation where i have to use regex Typically i try to learn a bit about it and look at examples of doing things similar to what i'...
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1answer
171 views

Python generating payload and parsing payload

(Using python) I am looking to generate a bytes (or can be string that I convert to bytes) that is a message to send over TCP. The format is [Header][Length][Payload]. Within [Header] is a [...
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2answers
780 views

Is a python `abstract property` that returns an abstract class an example of the Factory Pattern?

I need to document my design, in particular, the design patterns used, and would like to use the standard terminology. From Refactoring Guru, "Factory Method defines a method, which should be ...
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2answers
186 views

Python import order, mixing from ... import ... and import ... (and import ... as ...)

This is the mess of imports currently at the top of my file: import argparse from copy import deepcopy from functools import cmp_to_key, partial from itertools import chain import math from ...
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1answer
763 views

Python dynamically import modules

I am trying to find the best practice for importing modules dynamically. I have multiple files in a specific folder called providers which contain a class Updater and all of them have the same objects....
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1answer
50 views

Reading txt file till certain point and then create new txt file out of existing file

I have a txt file from where I want to create new files based on the data which is up to '$'character. My input file looks like: string1 string2 string3 $string4 string5 $string6 string7 ... (and so ...
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1answer
67 views

Test to check that executing a function does not raise an exception

I have the following function: def create_dic(): key_list = ['a','b'] val_list = [1, 2] dic = {} for i in range(2): dic[key_list[i]] = val_list[i] return dic I ...
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1answer
99 views

How to deploy python microservices app updates?

I'm working on python microservices based app and I'm wondering how to ship updates. Let's start by a summary of what I have: Code base on git (several repos) The app is running on several remote ...
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1answer
67 views

Class Design question concerning adding a new "DRAFT" state to an object

We have some entities in our code: -"View" and View has some attributes and also contains one or many "SubViews" -And each "SubView" has some attributes and contains one or more "Tweet" entities. ...
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1answer
67 views

Best practices when interfacing Python and C code

I have a piece of code that I developed in an academic context for which I would like to build a nice frontend. My approach to coding has been very academic to this point (read: I made stuff up as I ...
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0answers
100 views

Combine/Sync Amazon S3 and MongoDB Atlas with Elastic Search

I have many continuously growing (through scrapping) collections in MongoDB Atlas. The documents in each collection follows the following schema: { "source_url": "<some url on the web>", "html":...
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1answer
58 views

Finding the domain(s) of variables in a Linear Program using the constraints? (Constraint programming/Linear programming)

Forgive my jargon , as I'm not very familiar with Constraint Satisfaction Problem(s) or Linear Programming procedures (For eg: Presolve) I have very trivial constraint set from variables of ...
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1answer
220 views

Is Python's Django WebFramework good to design Expert System as a Web App?

I hope everyone is good. Well, I am at the end of my degree BS (Software Engineering), and in the third Phase of my Final Year Project named as 'Test Phase'. My Project is to build an Expert System ...
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1answer
144 views

Python Code Design - How should I have used OOP?

Edit: My main question is how would you structure and design code to accomplish the project I describe below. Please try and think of this as a technical interview question and you have to describe ...
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1answer
146 views

Proper program structuring in Python

So, recently I have been doing a lot of programming in Python. I have noticed that my programs can be somewhat hard to read. I usually have one main class which does everything, sort of like this: ...
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1answer
85 views

Event Handling in Pygame

I am working on setting up a game in pygame and I've noticed that there isn't really a lot available for event handling. Basically, pygame has a queue of events that you can pull and iterate through ...
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3answers
445 views

Birthday Paradox, Analytical and Monte Carlo solutions give two systemically slightly different results [closed]

I was doing a Monte Carlo implementation of the Birthday Paradox in Python and I wanted to check if the results where the same as in the analytical implementation of the same problem (As they should ...
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2answers
168 views

Python subclassed methods with additional arguments

Given the following structure where I want a method with a common name for each class, but each derived class needs an additional piece of information in order to form the appropriate result. ...
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1answer
130 views

How to expose multiprocessing python application to support invocation from command line and web

I have a python forecasting application that, for a given Entity, executes a fbprophet model multiple times varying the hyperparameters for each execution while tracking the best fit across the runs. ...
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2answers
858 views

What is the difference between unit testing and handling exceptions

I have spent two full days now trying to understand the difference between unit testing and handling exception, but I can't get it. Things I have understood (or I think I have): Unit testing tests ...
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0answers
107 views

How to design realtime deeplearning based application for robotics using python?

I have created a machine learning software that detects objects(duh!), processes the objects based on some computer vision parameters and then triggers some hardware that puts the object in the ...
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1answer
240 views

Upload fingerprint from android/ios to cloud

I am working on a project to use fingerprint to authenticate the user. I don't want the authentication to be device specific. Hence want to upload the user fingerprint to cloud. I do understand that ...
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0answers
2k views

What is the fastest way to parse variable record binary files in Python?

The Python Binary File Parsing Deep Dive Intro I'm an electrical engineer by trade, however my job has a lot of software engineering overlap. Recently something I've been working on is a Python ...
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1answer
310 views

Why do people keep reusing superclass names in their subclasses?

In my project, I found one of the project's classes reusing the same name as an official one. For example: from django.db import models class Model(models.Model): class Meta: abstract =...
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1answer
73 views

Api limit access to subscribers only

I have a vanilla php api(on a vds) and I want to make data coming from that api available to a few clients that are using a python app that's also written by me. That python app is running on my ...
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2answers
102 views

Having tasks that can be ran individually or "in trees", and each task can be blocking or non-blocking

I'm creating a framework that needs to execute certain tasks, I'll use building a car as an example for this. So, an individual task could be something like weld metal or screw bolt. But there are ...
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1answer
67 views

How do the (presumably sync) loop runners launch the async event loop?

Where is the implementation interface in Python documented that allows the async loop runners (from trio, asyncio, curio) to start the whole shebang? We know that sync functions cannot call async ...
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3answers
105 views

Options for parsing input that will include math

I'm working on a program that takes in user input which often includes things like math.sqrt(), imaginary numbers, multiplication, division, and similar (basically, standard math plus imaginary ...
4
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1answer
218 views

Is using getters to exchange information between objects acceptable?

Suppose I have the following Character, Potion, and PotionType classes: class Player: def __init__(self, name: str, health: int, mana: int): self._name = name self._attributes: ...
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1answer
284 views

what is a difference between resource and source in programming [closed]

I had a question for separating my python project files. What is a difference between "resource" and "source" in programming? When I should use "resource" separation and When I must use "source"?
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3answers
1k views

What is the safe way of using keyword-only arguments?

Keyword-only arguments are arguments that can only be supplied to a function by keyword. In Python they are defined by a single asterisk in a function's signature. For example: >>> def foo(...
2
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1answer
72 views

Why doesn't Python3 optimise variables assignments

I just read this SE question about parameter optimisation. I wondered if Python3 bytecode compilation does the same optimisation and this appeared not to be the case: >>> def f(a): return 2*...
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1answer
205 views

How to read user input and at the same time execute periodic commands

How would I go about prompting user-input, while at the same time running timers, to periodically execute automatic functions. Pseudo-code to illustrate: while true { if input() OR timer(10) ...
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1answer
87 views

Can i be two places at once in python cycle

I'm doing this in python, in case that changes anything. I'm trying to make a lamp/bit go 1-0-1-0 until the user says "okay" the "okay" should indicate that the user has found the lamp/Bit IRL. Now ...
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0answers
107 views

Python3: How to change the design of a class hierarchy to improve access to objects there buried?

I asked this question already at stackoverflow together with a serialization related part and at codereview for the design part only. Since the design related part receives no answers or comments on ...
2
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1answer
35 views

An approach to send the contents of a file on the server to the client in real-time

I have a relatively simple front in good ol' JQuery, that makes a POST Request to a Flask Python web server, that runs a Python script using the subprocess module. Here's the whole route for ...
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1answer
311 views

Does the fact that random.sample(seq, 1)[0] === random.choice(seq) mean that both functions should have the same precondition on seq?

I've read https://bugs.python.org/issue33098, which is about the following behavior of Python 3 a = {'1': 42, '2': 84} # keys are str on purpose, c.f. the issue import random random.choice(a.keys())...
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1answer
2k views

Convince people not to use an "end-of-life" Python 3.X version

Context At my company, we have a major Python package which is written in Python 2. We are now planning to migrate it to Python 3 (we don't care about keeping it Python 2 compatible). I am a junior ...
2
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1answer
95 views

Is it considered bad form to call `next` on the input sequence of a list comprehension?

I want to extract lines from a stream that are preceded by the character L. The list comprehension below does the job, but calls next on the stream inside the comprehension in a way I've never seen ...
171
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23answers
25k views

Programming cleanly when writing scientific code

I don't really write large projects. I'm not maintaining a huge database or dealing with millions of lines of code. My code is primarily "scripting" type stuff - things to test mathematical ...