python
Read a JSON file with clear errors
Load a JSON file and get a readable message when it is missing or malformed.
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9 snippet
python
Retry a flaky call with exponential backoff
A decorator that retries a function on chosen exceptions, waiting longer after each failure.
python
Cache expensive results
Memoize a pure function with functools.lru_cache.
python
Generate a secure random token
Use the secrets module (never random) for passwords, tokens and reset links.
python
Group items by a key
Turn a flat list into a dict of lists with collections.defaultdict.
python
Read and write CSV files
Read rows as dicts and write a filtered copy with csv.DictWriter.
python
Slugify a title
Turn any title into a lowercase, URL-safe slug.
python
Time a block of code
A tiny context manager that prints how long a block took.
python
Validate data with dataclasses
Use __post_init__ to reject bad values as soon as an object is created.
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