Python gotchas (comparisons to Elm lang)

[badlydrawnrob]

for loops

I'm used to List.filter so getting used to for loops again takes time.

Make sure you've exited the loop before raising an exception!

new_list = []

def loop(list):
    for item in list:
        if item == 3:
            new_list.append(item)
    # The correct indentation is OUTSIDE the loop,
    # not within the `if` or `for` loop.
    raise HTTPException(
        status_code=404,
        detail="Item with number 3 was not found"
    )        

if statements

In Elm you have must use the else keyword.
It's optional in Python.

def has_three(list):
    if len(list) == 3:
        return "Yes!"
    return "No!"

Using classes

You can use . dot notation to access fields ...
Dictionaries require dict["key"] (string accessors)

from pydantic import BaseModel
from typing import Optional

class Item(BaseModel):
    id: int
    name: Optional[str]

item = Item(id=1)
item.id # returns 1