names = []
for i in range(len(users)):
names.append(users[i].name)Deterministic line match: flags `for name in range(len(seq)):` where the argument is exactly `len()` of a name or dotted attribute. Reported at info severity.
ai-slop/python-range-len-loop
range(len()) loop.
`for i in range(len(items)):` is a C-style index loop where Python offers direct iteration or `enumerate`.
Examples
Flagged shape and clean shape.
Each example shows the exact code shape the rule is looking for, then the smallest version that keeps the intent without hiding risk or adding noise.
names = [user.name for user in users]
for position, user in enumerate(users, start=1):
print_row(position, user.name)Iterate directly (`for item in items`), use `enumerate(items)` when you need the index too, and `zip` when walking two sequences together.
Why an AI agent produces this
Agents carry index-loop habits over from other languages and keep the index plumbing even when the body only reads `items[i]`.
Provenance
How this rule is justified.
ai-slop/python-range-len-loop
ai-slop
Deterministic line match: flags `for name in range(len(seq)):` where the argument is exactly `len()` of a name or dotted attribute. Reported at info severity.
Direct iteration, `enumerate(...)`, and ranges with offsets or steps such as `range(1, len(x))` or `range(len(x) - 1)` are not flagged.
Shipped in aislop v0.9.4 as one of four Python verbosity rules drawn from SlopCodeBench (arXiv 2603.24755).