dict-index-missing-items (PLC0206)

Derived from the Pylint linter.

This rule is unstable and in preview. The --preview flag is required for use.

What it does

Checks for dictionary iterations that extract the dictionary value via explicit indexing, instead of using .items().

Why is this bad?

Iterating over a dictionary with .items() is semantically clearer and more efficient than extracting the value with the key.

Example

ORCHESTRA = {
    "violin": "strings",
    "oboe": "woodwind",
    "tuba": "brass",
    "gong": "percussion",
}

for instrument in ORCHESTRA:
    print(f"{instrument}: {ORCHESTRA[instrument]}")

Use instead:

ORCHESTRA = {
    "violin": "strings",
    "oboe": "woodwind",
    "tuba": "brass",
    "gong": "percussion",
}

for instrument, section in ORCHESTRA.items():
    print(f"{instrument}: {section}")