Dynamically define a Union of Literal permutations in Python

I have a list of strings:

strings = ['a','b','c']

I want to declare a Union of Literal types of all the possible ordered pairs of the list. Hardcoded, this would look like:

CustomType = Literal[
  'ab', 'ac', 'aa',
  'ba', 'bb', 'bc',
  'ca', 'cb', 'cc'
]

How could I define CustomType dynamically such that I don't have to manually put each combination?

I'm thinking something along the lines of:

CustomType = Literal[*permutations(strings)]

but that gives me the error:

Unpack operator in subscript requires Python 3.11 or newer 
 Pylance
Unpacked arguments cannot be used in type argument lists 
 Pylance

The objective motivating this question is to have Pylance detect if I try passing a string that is not an element of that set.

def f(string: CustomType):
  ...

f('foo') # Pylance will complain
f('ba') # Pylance will permit

source https://stackoverflow.com/questions/74075558/dynamically-define-a-union-of-literal-permutations-in-python

Comments

Confusion between commands.Bot and discord.Client | Which one should I use?

Whenever you look at YouTube tutorials or code from this website there is a real variation. Some developers use client = discord.Client(intents=intents) while the others use bot = commands.Bot(command_prefix="something", intents=intents) . Now I know slightly about the difference but I get errors from different places from my code when I use either of them and its confusing. Especially since there has a few changes over the years in discord.py it is hard to find the real difference. I tried sticking to discord.Client then I found that there are more features in commands.Bot . Then I found errors when using commands.Bot . An example of this is: When I try to use commands.Bot client = commands.Bot(command_prefix=">",intents=intents) async def load(): for filename in os.listdir("./Cogs"): if filename.endswith(".py"): client.load_extension(f"Cogs.{filename[:-3]}") The above doesnt giveany response from my Cogs ...

How to show number of registered users in Laravel based on usertype?

i'm trying to display data from the database in the admin dashboard i used this: <?php use Illuminate\Support\Facades\DB; $users = DB::table('users')->count(); echo $users; ?> and i have successfully get the correct data from the database but what if i want to display a specific data for example in this user table there is "usertype" that specify if the user is normal user or admin i want to user the same code above but to display a specific usertype i tried this: <?php use Illuminate\Support\Facades\DB; $users = DB::table('users')->count()->WHERE usertype =admin; echo $users; ?> but it didn't work, what am i doing wrong? source https://stackoverflow.com/questions/68199726/how-to-show-number-of-registered-users-in-laravel-based-on-usertype

Why is my reports service not connecting?

I am trying to pull some data from a Postgres database using Node.js and node-postures but I can't figure out why my service isn't connecting. my routes/index.js file: const express = require('express'); const router = express.Router(); const ordersCountController = require('../controllers/ordersCountController'); const ordersController = require('../controllers/ordersController'); const weeklyReportsController = require('../controllers/weeklyReportsController'); router.get('/orders_count', ordersCountController); router.get('/orders', ordersController); router.get('/weekly_reports', weeklyReportsController); module.exports = router; My controllers/weeklyReportsController.js file: const weeklyReportsService = require('../services/weeklyReportsService'); const weeklyReportsController = async (req, res) => { try { const data = await weeklyReportsService; res.json({data}) console...

StacksPedia

Search This Blog