boltons should be builtins.
Boltons is a set of over 230 BSD-licensed, pure-Python utilities in the same spirit as — and yet conspicuously missing from — the standard library, including:
- Atomic file saving, bolted on with fileutils
- A highly-optimized OrderedMultiDict, in dictutils
- Two types of PriorityQueue, in queueutils
- Chunked and windowed iteration, in iterutils
- Recursive data structure iteration and merging, with iterutils.remap
- Exponential backoff functionality, including jitter, through iterutils.backoff
- A full-featured TracebackInfo type, for representing stack traces, in tbutils
Boltons is tested against Python 2.6, 2.7, 3.4, 3.5, 3.6, 3.7, 3.8 and 3.9, as well as CPython nightly and PyPy/PyPy3.
Boltons can be added to a project in a few ways. There's the obvious one:
pip install boltons
On macOS, it can also be installed via MacPorts:
sudo port install py-boltons
Then, thanks to PyPI, dozens of boltons are just an import away:
from boltons.cacheutils import LRU my_cache = LRU()
However, due to the nature of utilities, application developers might want to consider other options, including vendorization of individual modules into a project. Boltons is pure-Python and has no dependencies. If the whole project is too big, each module is independent, and can be copied directly into a project. See the Integration section of the docs for more details.
The majority of boltons strive to be "good enough" for a wide range of basic uses, leaving advanced use cases to Python's myriad specialized 3rd-party libraries. In many cases the respective
boltons module will describe 3rd-party alternatives worth investigating when use cases outgrow
boltons. If you've found a natural "next-step" library worth mentioning, see the next section!
Found something missing in the standard library that should be in
boltons? Found something missing in
boltons? First, take a moment to read the very brief architecture statement to make sure the functionality would be a good fit.