2021-06-16 Javascript + Python timer + dataprotectioncontrol + libera.chat + mypy 0.900 (TypeGuard) + redis/postgresql ¶

Tuto javascript ¶

https://wesbos.com/javascript

Advanced Data Protection Control dataprotectioncontrol ¶

tom-select ¶

Python timer ¶

https://realpython.com/python-timer/

libera.chat ¶

https://twitter.com/VictorStinner/status/1404829225236959241?s=20

All Python IRC notifications moved to Libera Chat #python-dev-notifs: GitHub pull request reviews, http://bugs.python.org issues and comments, and buildbot state changes. Thanks @EWDurbin

! Also, I left Freenode. I’m sad Visage somnolent, but there is now the brand new Libera Chat Visage souriant avec 3 cœurs!

mypy 0.900 ¶

TypeGuard ¶

Mypy now supports defining user-defined functions that perform type narrowing, similar to isinstance .

Read PEP 647 for the details.

Here’s an example adapted from the PEP:

            from typing_extensions import TypeGuard

def is_str_list(val: List[object]) -> TypeGuard[List[str]]:
    """Are all list items strings?"""
    return all(isinstance(x, str) for x in val)

def func(val: List[object]) -> None:
    if is_str_list(val):
        print(" ".join(val))  # OK

           

Since TypeGuard will be included in Python 3.10, which hasn’t been released yet, you will have to import it from a recent version of typing_extensions for now.

This was contributed by Guido van Rossum (PR 9865).

Hosted Documentation for Mypyc ¶

We now have hosted user documentation for mypyc, the compiler we use to speed up mypy.

Mypyc is still experimental, but we are looking for early adopters.

Support for pyproject.toml ¶

You can now use a pyproject.toml file instead of mypy.ini for mypy configuration. Here is an example from the documentation:

            # mypy global options:

[tool.mypy]
python_version = "2.7"
warn_return_any = true
warn_unused_configs = true

# mypy per-module options:

[[tool.mypy.overrides]]
module = "mycode.foo.*"
disallow_untyped_defs = true

[[tool.mypy.overrides]]
module = "mycode.bar"
warn_return_any = false

[[tool.mypy.overrides]]
module = [
    "somelibrary",
    "some_other_library"
]
ignore_missing_imports = true

           

Do You Really Need Redis? How to Get Away with Just PostgreSQL ¶

https://spin.atomicobject.com/2021/02/04/redis-postgresql/

There’s a tried-and-true architecture that I’ve seen many times for supporting your web services and applications:

PostgreSQL for data storage
Redis for coordinating background job queues (and some limited atomic operations)

Redis is fantastic, but what if I told you that its most common use cases for this stack could actually be achieved using only PostgreSQL ?