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Python learning resources Beginner to advanced Python guides, cheatsheets, books and projects. For data science, backend and automation. Join 👉 https://rebrand.ly/bigdatachannels DMCA: @disclosure_bds Contact: @mldatascientist
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5 787
await Is Not Optional in Async
💻 You’re racing 10 API calls with asyncio… and it still takes 10 seconds. Sound familiar?
async def fetch():
return requests.get(url).json() # ← Blocks the entire event loop
✅ Fix: await every I/O. Swap requests for httpx (same API, truly async).
import httpx
async def fetch():
async with httpx.AsyncClient() as client:
r = await client.get(url)
return r.json()
▶️ Now 10 calls = 1 second.
5 787
Context Managers: The “Clean-Up Crew” of Python
Ever forget to close a file and wonder why your program is misbehaving?
Context managers prevent this headache.
When you use with, Python ensures that resources are properly acquired and released automatically. Think of it as hiring a clean-up crew: they take care of the dirty work while you focus on the important tasks.
with open('data.txt') as f:
data = f.read()
# file is automatically closed here5 787
🐍 PyQuiz
If Python can't find a variable locally, what's the next place it looks?
5 787
Context Managers: The “Clean-Up Crew” of Python
Have you ever forgot to close a file and wonder why your program is misbehaving?
Context managers prevent this headache.
When you use with, Python ensures that resources are properly acquired and released automatically. Think of it as hiring a clean-up crew: they take care of the dirty work while you focus on the important tasks.
with open('data.txt') as f:
data = f.read()
# file is automatically closed here5 787
🐍 PyQuiz
A Python function with no return statement actually returns:
5 787
Closures: Functions That Remember
Closures can be mystifying. Imagine a function inside another function, and the inner function remembers the outer function’s variables, even after the outer function has finished running.
Closures capture variables by reference, which is why beginners often stumble when using loops inside closures. They’re powerful once you understand that the inner function “remembers” its environment.
