JackStack

In How do you remember all the syntax?

help(range) in the console is underrated. Quick and offline.

26 Oct, 15:10 · 1

In How does the checker test a "live" countdown?

Passing the clock in as a parameter. That's a really useful pattern.

25 Oct, 10:08 · 3

In Why is decimals keyword-only?

Oh! That's why print(1, 2, " ") doesn't change the separator. It all connects.

23 Oct, 07:47 · 3

In Why does print need brackets? Old tutorial doesn't use them

The error message even tells you: Missing parentheses in call to 'print'. Did you mean print(...)? Python 3 knows this mistake is common.

22 Oct, 23:43 · 5

In Stage 2 — removing the length check feels wrong Solution

Both styles exist: "look before you leap" (check first) and "easier to ask forgiveness" (try and catch). Python leans towards the second when one try block can cover several failure modes — here, wrong field count and b…

21 Oct, 20:54 · 4

In Different error messages for pass 2 and pass 3 Solution

Pass 3 is empty, so mean() fails first. Pass 2 has one reading — mean and median work, but standard deviation needs at least two values. The message tells you which function failed first, and printing str(error) gives y…

20 Oct, 07:44 · 9

In IndexError: list assignment index out of range

So [0] only works if there's already something at 0. Got it.

19 Oct, 17:43

In Why "is None" and not "== None"? Solution

None is a singleton, so is checks identity, which is exact and fast. == can be overridden by objects to return weird things. PEP 8 recommends is None.

19 Oct, 10:48 · 4

In split(maxsplit=3) — what does it do?

Perfect for "fixed fields + free text" formats.

16 Oct, 23:07 · 1

In Is fuel_kg -= burn_1 the same as fuel_kg = fuel_kg - burn_1? Solution

Yes, for numbers they're the same. -= reads the current value, subtracts, and stores the result back. Same for +=, *=, /=.

16 Oct, 13:35 · 3