fork(1) download 
  1. import functools
  2.  
  3. _DEPENDENCIES = {}
  4.  
  5. def register_dependency(dependency, object):
  6.     _DEPENDENCIES[dependency] = object
  7.  
  8. def lookup_dependency(dependency):
  9.     return _DEPENDENCIES[dependency]
  10.  
  11. def depends(*dependencies):
  12.     def decorator(f):
  13.         @functools.wraps(f)
  14.         def wrapper(*args, **kwargs):
  15.             for dependency in dependencies:
  16.                 if dependency not in kwargs:
  17.                     kwargs[dependency] = lookup_dependency(dependency)
  18.             return f(*args, **kwargs)
  19.         return wrapper
  20.     return decorator
  21.  
  22. ################################################################################
  23.  
  24. register_dependency('printer', print)
  25.  
  26. class Greeter:
  27.     @depends('printer')
  28.     def __init__(self, printer):
  29.         self.printer = printer
  30.  
  31.     def greet(self, person):
  32.         self.printer('Hello, {0}!'.format(person))
  33.  
  34. register_dependency('greeter', Greeter())
  35.  
  36. @depends('greeter')
  37. def salute(person, greeter):
  38.     greeter.greet(person)
  39.  
  40. salute('rightfold')
  41.  
Success #stdin #stdout 0.03s 9440KB
comments (?)
stdin 
Standard input is empty
stdout 
Hello, rightfold!
https://ideone.com/EEpuRN
language:
Python 3 (python  3.9.5)
created:
10 years ago
visibility:
public

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