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--- wiki2:python3 [2020/06/20 13:13]
alfred [Other tools]
+++ wiki2:python3 [2022/10/12 19:03] (actual)
@@ Línea 88: / Línea 88: @@
 Co-routines are functions that in a way similar to green threads are executed in a single thread and process. However, they are not so costly as are not managed by the operating system but by the **event loop**.
+For an advance use go to [[wiki2:python:notes#advanced_asyncio|Advanced asyncio]].
 ==== Basic points ====
@@ Línea 392: / Línea 393: @@
   * [[https://news.ycombinator.com/item?id=23498742|Discussion on Hacker News]]
+=== functools.partial for passing arguments ===
+''functools.partial'' allows to create a function that not requires arguments from one that requires them.
+<code python>
+loop.call_soon(partial(print, "Hello", flush=True))
+</code>
+=== Stop co-routines when signals ===
+<code python>
+import asyncio
+import functools
+import os
+import signal
+def ask_exit(signame, loop):
+    print("got signal %s: exit" % signame)
+    loop.stop()
+async def main():
+    loop = asyncio.get_running_loop()
+    for signame in {'SIGINT', 'SIGTERM'}:
+        loop.add_signal_handler(
+            getattr(signal, signame),
+            functools.partial(ask_exit, signame, loop))
+    await asyncio.sleep(3600)
+print("Event loop running for 1 hour, press Ctrl+C to interrupt.")
+print(f"pid {os.getpid()}: send SIGINT or SIGTERM to exit.")
+asyncio.run(main())
+</code>
+===== Enums =====
+<code python>
+from enum import Enum
+class Numbers(Enum):
+    ONE = 1
+    TWO = 2
+number = Numbers(2)  # <Numbers.TWO: 2>
+number1 = Numbers["ONE"]  # <Numbers.TWO: 2>
+members = [n for n in Numbers]  # [<Numbers.ONE: 1>, <Numbers.TWO: 2>]
+values = [n.value for n in Numbers]  # [1, 2]
+</code>
+==== Links ====
+  * https://realpython.com/python-enum/
+===== Python type checking =====
+<code>
+pi: float = 3.142
+def headline(text: str, align: bool = True) -> str:
+    pass
+</code>
+The ''MyPy'' library allows to check code files.
+<code>
+>>> names: list = ["Guido", "Jukka", "Ivan"]
+>>> version: tuple = (3, 7, 1)
+>>> options: dict = {"centered": False, "capitalize": True}
+>>> from typing import Dict, List, Tuple
+>>> names: List[str] = ["Guido", "Jukka", "Ivan"]
+>>> version: Tuple[int, int, int] = (3, 7, 1)
+>>> options: Dict[str, bool] = {"centered": False, "capitalize": True}
+</code>
+<code>
+import random
+from typing import Any, Sequence
+def choose(items: Sequence[Any]) -> Any:
+    return random.choice(items)
+</code>
+<code>
+class Animal:
+    def __init__(self, name: str, birthday: date) -> None:
+        self.name = name
+        self.birthday = birthday
+    @classmethod
+    def newborn(cls, name: str) -> "Animal":
+        return cls(name, date.today())
+    def twin(self, name: str) -> "Animal":
+        cls = self.__class__
+        return cls(name, self.birthday)
+</code>
+<code>
+def headline(text, width=80, fill_char="-"):
+    # type: (str, int, str) -> str
+    return f" {text.title()} ".center(width, fill_char)
+def headline(
+    text,           # type: str
+    width=80,       # type: int
+    fill_char="-",  # type: str
+):                  # type: (...) -> str
+    return f" {text.title()} ".center(width, fill_char)
+</code>
 ===== Notes =====

Programming

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