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--- wiki2:python:notes [2020/06/20 13:46]
alfred [Advanced asyncio]
+++ wiki2:python:notes [2022/01/15 08:41] (actual)
@@ Línea 78: / Línea 78: @@
 ===== Advanced asyncio =====
+For a basic use go to [[wiki2:python3#asyncio_package|asyncio package]].
+A good video about advanced asyncio: https://youtu.be/sW76-pRkZk8
+==== asyncio perks ====
+You can store the function and call it later:
+<code python>
+import asyncio
+async def speak():
+    print('C')
+    await asyncio.sleep(3)
+    return 'D'
+async def run():
+    will_speak = speak()
+    print('A')
+    print('B')
+    print(await will_speak)
+loop = asyncio.get_event_loop()
+loop.run_until_complete(run())
+# Prints: A B C D
+</code>
+You can wait until all the co-routines are finished:
+<code python>
+async def run():
+    f = []
+    for x in range(1, 6):
+        f.append(meow(x))
+    await asyncio.wait(f)
+</code>
+==== Testing ====
+=== Mocking co-routines ===
+<code python>
+from unittest.mock import AsyncMock
+@pytest.fixture()
+def mock_sum(mocker):
+    async_mock = AsyncMock()
+    mocker.patch('app.sum', side_effect=async_mock)
+    return async_mock
+@pytest.mark.asyncio
+async def test_sum(mock_sum):
+    mock_sum.return_value = 4
+    result = await app.sum(1, 2)
+    assert result == 4
+</code>
+==== asyncio on Django ====
+=== django-simple-task package ===
+  * https://pypi.org/project/django-simple-task/
+<code python>
+from django_simple_task import defer
+def task1():
+    time.sleep(1)
+    print("task1 done")
+async def task2():
+    await asyncio.sleep(1)
+    print("task2 done")
+def view(requests):
+    defer(task1)
+    defer(task2)
+    return HttpResponse(b"My View")
+</code>
 ==== Libraries ====
   * [[https://docs.aiohttp.org/en/stable/|AIOHTTP]], a ''requests'' async alternative.
+===== Black =====
+Launch black for those .py file which are gonna be commited:
+<code>
+git diff --name-only | grep ".py$" | xargs black
+</code>
+===== Notes =====
+==== Install a new version of python ====
+To install a new version of python do:
+<code>
+sudo apt-get install python3.8 python3.8-dev python3.8-distutils python3.8-venv
+</code>
+==== try\except\finally perks ====
+This code...
+<code python>
+def should_rise(flag):
+    if flag:
+        raise Exception()
+def my_function(flag):
+    try:
+        should_rise(flag)
+        print("1")
+        return "1"
+    except:
+        print("2")
+        return "2"
+    finally:
+        print("3")
+        return "3"
+print("f", my_function(False))
+print("---")
+print("f", my_function(True))
+</code>
+Prints:
+<code>
+f 3
+---
+f 3
+</code>
+==== Install package for the user ====
+<code>
+pip install --user mypy
+</code>
+Executables are found in ''~/.local/bin'' so you can do the next:
+<code>
+export PATH="$PATH:$HOME/.poetry/bin:$HOME/bin:$HOME/.local/bin"
+</code>

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