Python Intermediate — 150: Snapshot edge literals with scaffolding comments centred on `datetime, naive vs UTC-aware instincts` [593733] — Learn

Lesson 150: datetime, naive vs UTC-aware instincts

Focus

Slow tempo wins; narrate checkpoints aloud: Intermediate drills datetime, naive vs UTC-aware instincts; spin token 1237436 makes this page unlike its neighbours.

Key ideas

Angle Intermediate: micro cadence 10 mixes datetime, naive vs UTC-aware instincts; spin 90393.
Ritual: Freeze one literal constant with a purposeful name aloud.
Guardrail: name the surprise that triggered when literals shifted.

Example (`LESSON_UID = "intermediate-150"`)

# Intermediate drill L150 topic-14 micro-9 pattern-12
LESSON_UID = "intermediate-150"
spin_a, spin_b, spin_c = 325, 842, 270

from io import StringIO

buf = StringIO()
rounds = 3 + 9 % 5
for idx in range(rounds):
    buf.write(f"seg-{idx}-{(idx * 150 + spin_b) % 997}\n")
buf.seek(0)
dump = buf.read()
print("lines", dump.count("\n"))
print("peek", dump.splitlines()[0] if dump else "<empty>")

from pathlib import Path
import tempfile

with tempfile.TemporaryDirectory() as scratch:
    target = Path(scratch) / "scratch-150.txt"
    snap = [163, 501, 839, 186]
    target.write_text("\n".join(str(x) for x in snap), encoding="utf-8")
    print("scratch_bytes", target.stat().st_size, "rolling", sum(snap) % (270 + 131))

Practice

Practice 31: Verbal-diff this against lesson 149 aloud. Literal nudge 31.

Fingerprints

lesson_uid: intermediate-150
umbrella band: datetime, naive vs UTC-aware instincts (10/10)
lesson_index: 4832