human
Solve the following python programming problem given the following code:
@ classmethod 
def get_constructor(cls, key, options) : 
    if constructor.thread_safe : 
        def constructor() : 
            if (key not in cls._connections) : 
                cls._connections [key] = cls (** options) 
return cls._connections [key] 
return constructor 
else : 
        def constructor() : 
            if (not getattr (cls._threaded_connections, key, None)) : 
                setattr (cls._threaded_connections, key, cls (** options)) 
return getattr (cls._threaded_connections, key) 
return constructor 

    
    

    Fix the buggy line: if constructor.thread_safe :
assistant
#Here is Python code to fix the buggy line: if constructor.

if cls.thread_safe :