age=10
assert 0<age<10
age=-1
assert 0<age<10,'the age must be realistic'
第2行就结束了，没有到第4行
age=10
assert 0<age<10, 'the age is not in 1~9'
age=-1
assert 0<age<10,'the age must be realistic'第二行断言失败，终止了