# your code goes here
import ast
block = "set_value('user_city', get_slot('city_entity'), 'unknown') if get_slot('city_entity') else None"
print(repr(ast.parse(block)))
IyB5b3VyIGNvZGUgZ29lcyBoZXJlCmltcG9ydCBhc3QKCmJsb2NrID0gInNldF92YWx1ZSgndXNlcl9jaXR5JywgZ2V0X3Nsb3QoJ2NpdHlfZW50aXR5JyksICd1bmtub3duJykgaWYgZ2V0X3Nsb3QoJ2NpdHlfZW50aXR5JykgZWxzZSBOb25lIgoKcHJpbnQocmVwcihhc3QucGFyc2UoYmxvY2spKSk=