1、if-else语句

Tom_age = input('The age of Tom:' )Mary_age = input('The age of Mary:')if Tom_age > Mary_age:     print('Tom older than Mary.')else:    print('Mary older than Tom.')#如果Tom和Mary的年龄一样大怎么办？

输出结果：

The age of Tom:15

The age of Mary:14

Tom older than Mary.

2、if-elif-else

Tom_age = input('The age of Tom:' )Mary_age = input('The age of Mary:')if Tom_age > Mary_age:     print('Tom older than Mary.')elif Tom_age == Mary_age:    print('Mary is as old as Tom.')else:    print('Tom younger than Mary.')

The age of Tom:11

The age of Mary:11

Mary is as old as Tom.