摘要：def test(x): "the function definitions" x += 1 return x# 为什么要有返回值，需要函数执行的结果 #return x# x 可以为任意类型，任意个数。。。# 1.不写return > 返回none# 2.写return 0 > 返回0# 3.写r 阅读全文

摘要：address_info = { "中国":{ "山西":{ "太原":["小店","迎泽"], "长治":["长子","长治县"] }, "陕西":["汉中","咸阳"], "河北":["石家庄","邯郸"] }, "美国":{ "纽约":["a",&quo 阅读全文