Supplier: Python library for passing values deeply, easily!

Have you ever had a piece of configuration that you want access to deeply in a function, but you don't want to always have to pass it, and you don't want to have a singleton?

This is for you!

Example

from supplier import Supplier, supply

config_supplier = Supplier('config')

def outer_function():
  inner_function()

@supply(config_supplier)
def inner_function(config):
  do_something_based_on(config)

with config_supplier.use(Config()):
  outer_function()

This is essentially python contextvars + contextlib in one convenient package

@supply allows multiple function arguments

Supplier prepends the function's arguments with the supplied value.

@supply(foo_supplier)
def func_with_args(foo, arg1, arg2):
  print(foo, arg1, arg2)

with foo_supplier.use("foo"):
  func_with_args("arg1", "arg2")

@supply works with multiple suppliers

You can supply multiple variables simultaneously.

@supply(foo_supplier, bar_supplier)
def doubly_provided_func(foo, bar, arg):
  print(foo, bar, arg)

with foo_supplier.use("foo"), bar_supplier.use("bar"):
  doubly_provided_func("arg")