一、if语句

  1. if condition_1:
  2.     statement_block_1
  3. elif condition_2:
  4.     statement_block_2
  5. else:
  6.     statement_block_3
  1. tmp = 100
  3. if tmp:
  4.     print('tmp', tmp)
  6. age = int(input("请输入你的年龄:"))
  8. if age < 18:
  9.     print('您还是未成年人！')
  10. elif age >= 18 and age <= 60:
  11.     print("您是青年人")
  12. elif age > 60:
  13.     print("您已经可以退休了！")
  15. input("您可以退出了")