HighFile-scopePython Plug & play

Handle file operations errors

Guard file IO with try/except; handle OSError and data parse errors with clear messages.

Why this matters

Prevents crashes when files are missing, locked, or malformed.

Bad vs. good

Side-by-side examples engineers can pattern-match during review.

Avoid

data = open(path).read()

Prefer

import json
try:
    with open(path, 'r', encoding='utf-8') as f:
        data = json.load(f)
except FileNotFoundError:
    logger.error('file not found', extra={'path': path})
except (OSError, json.JSONDecodeError) as e:
    logger.exception('read failed', extra={'path': path})
    raise

More snippets

Bad

open(path).read()

Good

with open(path) as f: ...;  # try/except around

Related rules

From the same buckets as this rule.

Critical
Avoid equality operators in loop termination conditions
Check if loops use equality operators (== or !=) in termination conditions. These can lead to infinite loops if the condition is never met exactly. Instead, use relational operators like < or > for safer loop termination.
error-handlingreadability-refactor
Critical
Avoid Returning Null in Non-Async Task Methods
Returning null from a Task or Task<T> method causes a NullReferenceException if awaited. Use Task.CompletedTask or Task.FromResult<T>(null) instead.
error-handlingreadability-refactor+1
Critical
Avoid Using Boolean Expressions in `except` Statements
Detect `except` clauses that use `or` or `and` to catch multiple exceptions. This does not work as intended. Recommend using a tuple of exceptions instead.
error-handlingstack-python

Why this matters

Bad vs. good

More snippets

Related rules

Avoid equality operators in loop termination conditions

Avoid Returning Null in Non-Async Task Methods

Avoid Using Boolean Expressions in `except` Statements

Why this matters

Bad vs. good

More snippets

Related rules

Avoid equality operators in loop termination conditions

Avoid Returning Null in Non-Async Task Methods

Avoid Using Boolean Expressions in `except` Statements