pydollar is a Python module which enables a non-native syntax for the dollar sign $ in Python code. It allows you to follow the DRY-principle (don't repeat yourself) more stricly when writing python code:
Take for example a file called mymodule.py:
from sympy import Symbol
def my_func():
alpha, beta, gamma, delta, epsilon = symbs = list(map(Symbol, $))
return symbswe could then import from it by first intalling an import hook:
>>> import pydollar
>>> pydollar.install_import_hook()
>>> from mymodule import my_func
>>> from sympy import init_printing
>>> init_printing(pretty_print=True, use_unicode=True)
>>> sum([x**(i+1) for i, x in enumerate(my_func())])
2 4 5 3
α + β + δ + ε + γ f-strings were a great additon to Python 3.6, the $ syntax follows it in spirit, it simply allows you to write succinct code.
If $ syntax (or more importantly, the functionality it provides) becomes official syntax there would be a real-world benefit to widely used codebases, e.g. SymPy:
https://github.com/sympy/sympy/blob/sympy-1.0/sympy/core/symbol.py#L587
Simplest way to install pydollar is to use pip:
$ python3 -m pip install --user pydollaryou can skip the --user flag if you have got root permissions.
See the test files under tests/.
The source code is Open Source and is released under the very permissive "simplified (2-clause) BSD license". See LICENSE for further details.
Contributors are welcome to suggest improvements at https://github.com/bjodah/pydollar
- Björn I. Dahlgren, contact:
- gmail address: bjodah