Erlang-like atoms in Python 3
Atum is a tiny Python library that you can use to emulate the basic functionality of Erlang’s atom in your Python scripts.
Status: Beta; this is an experiment.
An atom is a literal, a constant with name. An atom is to be enclosed in single quotes (’) if it does not begin with a lower-case letter or if it contains other characters than alphanumeric characters, underscore (_), or @. Examples:hello phone_number 'Monday' 'phone number'
Unlike Erlang’s atom, atum does not impose the same limitations. You may import any valid Python name from atum - even all uppercase.
$ pip install atum
Instead of writing:
@app.route('/register', methods=['GET', 'POST']) def register(): pass
You could write:
from atum import GET, POST @app.route('/register', methods=[GET, POST]) def register(): pass
This might be useful if you use autocompletion. Another benefit is exceptions occur sooner in case of typos, since the interpreter itself validates the imported names. Pay attention when importing, simply tab-to-complete later.
You can compare an atum with another atum or a string.
from atum import machine, human assert human == human assert machine == machine assert machine == 'machine' assert human != machine assert human is human assert machine is machine
Atums also make for readable sentinel values or event-names.
from atum import user_is_awake from queue import Queue q = Queue() q.put(user_is_awake) assert q.get() == user_is_awake
Atum simply imports Python strings with the same content as their name.
Here is the content of atum.py in its entirety:
import sys as _sys # intern() is a builtin in Python 2. if _sys.version_info > (3, 0): intern = _sys.intern class Atum(object): def __getattr__(self, item): if item.startswith('__'): return self.__getattribute__(item) return intern(item) def __getitem__(self, item): return item _sys.modules[__name__] = Atum()
- Atum does not support using @ in imported names as Python’s syntax does not allow it.
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