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from_str_decorator.py
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from_str_decorator.py
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from functools import wraps
def from_str_init(func):
'''
Decorator that auto initializes class annotations with positional arguments passed to __init__
kwargs may still be passed and handled by class's __init__
if class has a from_str method defined, a single string representation may be passed and will be interpreted by said method
from_str needs to return a tuple of __init__ positional arguments
'''
@wraps(func)
def inner(self, *args, **kwargs):
func(self, *args, **kwargs)
if 'from_str' not in self.__dir__(): return
for name, val in zip(self.__annotations__, args):
if len(args) == 1 and type(args[0]) is str:
for k, v in zip(self.__annotations__, self.from_str(val)):
assert self.__annotations__[k] == type(v), f'from_str type does not match expected type, expected: {self.__annotations__[k]}, actual: {type(v)}'
setattr(self, k, v)
break
elif self.__annotations__[name] == type(val):
setattr(self, name, val)
return inner