Python snippets

Scripts, data handling and standard-library recipes.

21 snippets

Python Tested
Remove duplicates but keep order
Deduplicate a list while preserving the first occurrence order, for hashable values or by key.
Python Tested
Dataclass with validation
Validate and normalize fields in __post_init__ so invalid objects can never be created.
Python Tested
Read typed settings from environment variables
Load configuration from the environment with defaults, type conversion and clear errors for missing values.
Python Tested
Write a file atomically
Write to a temporary file and rename it into place so readers never see a half-written file.
Python Tested
Command-line tool skeleton with argparse
A small CLI with a positional argument, flags, a main function and proper exit codes.
Python Tested
Verify a webhook HMAC signature in Python
Validate a signed webhook body with hmac.compare_digest and a timestamp tolerance.
Python Tested
Retry decorator with exponential backoff
Re-run a flaky function a limited number of times with growing delays, only for chosen exception types.
Python Tested
Count word frequency in text
Tokenize text and list the most common words using collections.Counter.
Python Tested
Split any iterable into batches
Yield fixed-size lists from a list, generator or file without loading everything into memory.

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