分系，利用字典
"北京“：{
}
”昌平“：{
}
“沙河”：{
}
“朝阳”：{
}
"望京":{
}
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"国贸”：{
}
ald _las = False
while not als_las:
for i in data:
choile = iinpot ("选择输入1》》:")
if choile in data:
while not ald_las:
for in2 in data(choile):
print(‘、t.,i2)
choile = inpot("选手输入.2>>:")
if choile in data(choile):
while not ald_las:
for in3 in data(choile):
print(‘、t.,i3)
choile2 = input ("最后一层,按b返回》》：”）
if choile = ="b"
pass