Python coding tricks

Tooling

Re-import modules

The issue: Python caches module imports. Therefor reimporting fixed code actually doesn't change anything.

First solution, interpreter agnostic:

import importlib
importlib.reload(my_module)

Ipython shortcut:

# just run, don't import
%run my_file(.py)

# activate autoreload
%load_ext autoreload
%autoreload 2

More info at the source (including a few caveats).

Data Types

Enums

It basically looks like an immutable data bag.

from enum import auto, unique, Enum

@unique  # validate each field is unique
class Ticker(Enum):
    idx = auto()  # auto seq id
    company = 'google'
    price = 1023

Ticker['company'] == Ticker.company  # True
Ticker('google').name  # company

Interesting Links

• Inside python dict — an explorable explanation