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# modify list message
unprinted_designs = ['iphone case','robot pendant','dodecahedron']
completed_models = []
def print_models(unprinted_designs,completed_models):
while unprinted_designs:
current_design = unprinted_designs.pop()
completed_models.append(current_design)
def show_completed_models(completed_models):
for complete_model in completed_models:
print(complete_model)
print_models(unprinted_designs,completed_models)
print(completed_models)
show_completed_models(completed_models)
运行时发生错误，如图
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