r2 = {'name':'高小一', 'age':18, 'salary':30000, 'city':'北京'}
r3 = {'name':'高小二', 'age':19, 'salary':20000, 'city':'上海'}
r4 = {'name':'高小五', 'age':20, 'salary':10000, 'city':'深圳'}
tb =[r2,r3,r4]

for i in tb: # i属于tb列表,依次循环
if i.get('salary')>=15000: # 如果i中的'salary'大于等于15000则输出i
print(i)