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if 语句的非怎样做？比如，r=image.find_template(template.......,当有匹配的模板时，if r进入。当没有匹配时，怎样进入if ？就是r为非时怎样进入if ？
if r: print('找到了') else: print('没找到')
或者
if not r: print('没找到')