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This week in Python, we embark on a journey to demystify Asyncio by rebuilding it from the ground up, catch up on the latest enhancements in pip 25.1, and explore advanced Python features that can elevate your coding prowess. Complementing these insights, we present a practical mission to parse crontab timing expressions and calculate upcoming execution datetimes, putting your scheduling logic to the test.

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🏁 MISSION

Crontab Parsing by freeman_lex -

Linux Crontab command is a powerful utility that is used for scheduling and automating tasks in Unix-like operating systems. In this mission your task is to parse a crontab timing expression (crontab format MIN HOUR DOM MON DOW), return a sorted ascending list of next 3 execution datetimes based on a provided current datetime (ISO format YYYY-MM-DDTHH:MM).

assert next_crontab_exec("* * * * *", "2025-03-03T14:30") == [
    "2025-03-03T14:31",
    "2025-03-03T14:32",
    "2025-03-03T14:33",
]
assert next_crontab_exec("*/15 * * * *", "2025-03-03T14:30") == [
    "2025-03-03T14:45",
    "2025-03-03T15:00",
    "2025-03-03T15:15",
]

📖 ARTICLES

Asyncio Demystified: Rebuilding it From Scratch One Yield at a Time -

Get a better understanding of how asyncio works in Python, by building a lightweight version from scratch using generators and coroutines.

What's new in pip 25.1 -

Pip 25.1 introduces support for Dependency Groups, resumable downloads and an installation progress bar. Learn more in the following article.

14 Advanced Python Features -

Edward has collected a series of Python tricks and patterns that he has used over the years. They include typing overloads, generics, protocols, and more.

👩‍💻CODE SHOT

What do you think the following code does?

???????? = lambda a, g=__import__("itertools").groupby: [sum(v) for _, v in g(a)]

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