Python Basic — 145: Fold edge literals with tuple witnesses centred on `Scope, locals, and shadowing pitfalls` [377945] — Learn

Lesson 145: Scope, locals, and shadowing pitfalls

Focus

Anchor one invariant before you branch mentally: Basic drills Scope, locals, and shadowing pitfalls; spin token 1242039 makes this page unlike its neighbours.

Key ideas

Angle Basic: micro cadence 5 mixes Scope, locals, and shadowing pitfalls; spin 31867.
Ritual: List two regressions CI should catch later.
Guardrail: separate demo-trick from shipping discipline verbally.

Example (`LESSON_UID = "basic-145"`)

# Basic drill L145 topic-14 micro-4 pattern-7
LESSON_UID = "basic-145"
spin_a, spin_b, spin_c = 292, 860, 358

src = [((k + 145) * spin_a + 4) % 241 for k in range(4 + 4 % 3)]
derived = [v * v if v % 2 == 0 else v + spin_b for v in src]
print("src", src)
print("derived", derived)
print("zip_sum", sum(x + y for x, y in zip(src, derived)))

Practice

Practice 27: Attach property-style expectations referencing tuple shapes. Literal nudge 27.

Fingerprints

lesson_uid: basic-145
umbrella band: Scope, locals, and shadowing pitfalls (5/10)
lesson_index: 4637