First Commit Lab

I'm Nat.
I turn boring dev docs into cheat sheets you'll actually use 🤌🏼
Git · Python · SQL · JS · Docker · Linux — start with the FREE Git sheet ⬇️

[First Commit Lab @firstcommitlab]

I'm Nat. I turn confusing coding docs into plain English for beginners.

if git, python, sql or AI tools make you feel lost, stick around:
- one simple tip a day
- quick quizzes
- memes about the pain

cheat sheets: https://t.co/yelxnEcHQI

[First Commit Lab @firstcommitlab]

It prints [1, 2, 3, 4]. a and b point to the same list, not a copy. If this kind of thing trips you up, the free cheat sheet is here: https://t.co/yelxnEca1a

[First Commit Lab @firstcommitlab]

CAN YOU SOLVE THIS? NO PEEKING.

a = [1, 2, 3]
b = a
b.append(4)
print(a)

What does it print? Make your guess first, then look down in the replies for the answer.

This one trips a lot of beginners, and it's not because the code is long. In everyday language, "b = a" sounds like "make b a copy of a." In Python, for a list, that line does not make a new list. It gives the same list a second name.

That's why a change made through one name can show up through the other. People miss it when they're moving fast, because the line looks so simple.

If you actually wanted a separate list, copy it:

b = list(a)

or:

b = a.copy()

Then changes to b stay on b.

This week, any time you point a new name at a list, pause and ask: do I want a second name, or a copy? If you want a copy, use one of those two lines.

Don't scroll to the answer until you've guessed. Check the replies after, and see if you were right.

I made a short cheat sheet on this. Try the free one first, it's down below.

[First Commit Lab @firstcommitlab]

@yasser19_88 Hi 👋

[First Commit Lab @firstcommitlab]

@0shxx0 Ready!

[First Commit Lab @firstcommitlab]

@rrr981532 BOOST

[First Commit Lab @firstcommitlab]

@sylithon YES 👋

[First Commit Lab @firstcommitlab]

@fuyu_kasumiii yo👋

[First Commit Lab @firstcommitlab]

@theo translation: same task, same plan, it shouldn't eat your limit any faster. if it does, report it. finally a bug report people will be happy to write

[First Commit Lab @firstcommitlab]

@PythonPr nested loops multiply the work. three loops over 100 items each is a million steps. the laptop fan will file a complaint

[First Commit Lab @firstcommitlab]

@realpython a list is fast at the back and slow at the front. a deque is fast at both ends. the one queue that doesn't make you wait in line

[First Commit Lab @firstcommitlab]

404 vs 500 — whose fault is it?

4xx means the request. 5xx means the server.
And 401 and 403 are not the same thing.

Save this for the next confusing error.

[First Commit Lab @firstcommitlab]

@codeSTACKr ask the agent for smaller changes. a small diff gets read. a giant one gets a thumbs up and a prayer

[First Commit Lab @firstcommitlab]

@Prince_of_web3_ hello

[First Commit Lab @firstcommitlab]

@buildwithpb coding isn't dead for juniors, it moved to review. prompting writes the code. knowing a little code is how you notice it's wrong before your users do

[First Commit Lab @firstcommitlab]

@PythonPr same output, less ceremony. python just skips the paperwork and the semicolon you forgot on line 3

[First Commit Lab @firstcommitlab]

@realpython "live in the API" means you can call it from your own code today. finding the API key page is still the hardest step

[First Commit Lab @firstcommitlab]

@levelsio a text waits until you're free. a call decides you're free now

[First Commit Lab @firstcommitlab]

@jude202608 Hope

[First Commit Lab @firstcommitlab]

Quick Git check.

You edit https://t.co/uiCcy3GIdJ, git add it, edit it again, then commit.

Does that second edit get committed?

A) Yes
B) No — add again first
C) Only if you force

Guess first. Then watch.