pydantic arg example

gistfile1.txt

class OriginalClass:
    
    start : str
    end : str
    
    def __init__(self, gen_string = None, start = None, end = None):
        
        if gen_string:
            start = gen_string[0:2]
            end = gen_string[2:4]
            
        self.start = start
        self.end = end
        
example = OriginalClass('1y2y')
print(example.start)  # '1y'
print(example.end)  # '2y'
        
        
class PydanticVersion:
    start : str
    end : str    
    
    @rootvalidator(pre=True)
    def process_values(cls, values):
        gen_string = values.get('gen_string', None)
        start = values.get('start', None)
        end = values.get('end', None)
        
        if gen_string:
            start = gen_string[0:2]
            end = gen_string[3:4]
            
        start = start
        end = end
        return values
 
# I would like the user to still be able to init with just a single string, and let the root validator (or another method) take care of the rest.  There is only ever 1 unnamed arg at most.  

# so something like this, PydanticVersion('1y1y') should be a valid call