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Added Type annotations

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Brandon Rozek 2020-07-11 20:18:46 -04:00
parent 49397eebfd
commit f8d002207d
1 changed files with 7 additions and 6 deletions
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13
content/blog/pysubscribepattern.md
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@ -12,10 +12,11 @@ It is common for larger applications to have modules that publishes and subscrib
First let us concern ourselves with a single event since that's the easiest. Here we will create an application class that stores callbacks of functions through the subscribe decorator. Calling `emit` will send a message to all the functions stored in `self.callbacks`. First let us concern ourselves with a single event since that's the easiest. Here we will create an application class that stores callbacks of functions through the subscribe decorator. Calling `emit` will send a message to all the functions stored in `self.callbacks`.
```python ```python
from typing import Callable, List
class Application: class Application:
def __init__(self): def __init__(self):
self.callbacks = [] self.callbacks: List[Callable] = []
def subscribe(self, func): def subscribe(self, func: Callable):
if not callable(func): if not callable(func):
raise ValueError("Argument func must be callable.") raise ValueError("Argument func must be callable.")
self.callbacks.append(func) self.callbacks.append(func)
@ -53,12 +54,12 @@ Let's say you want the application to handle different types of events. Now `sel
```python ```python
from collections import defaultdict from collections import defaultdict
from typing import Callable, Optional
class Application: class Application:
def __init__(self): def __init__(self):
self.callbacks = defaultdict(list) self.callbacks: Dict[str, List[Callable]] = defaultdict(list)
def on(self, event, func=None): def on(self, event: str, func: Optional[Callable] = None):
def subscribe(func): def subscribe(func: Callable):
if not callable(func): if not callable(func):
raise ValueError("Argument func must be callable.") raise ValueError("Argument func must be callable.")
self.callbacks[event].append(func) self.callbacks[event].append(func)