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
Full and extensive docs are available on Read The Docs. See what's new by checking the CHANGELOG.
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
will describe 3rd-party alternatives worth investigating when use
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.
Then, if you are very motivated, submit a Pull Request. Otherwise, submit a short feature request on the Issues page, and we will figure something out.