Python-程序流程控制

程序流程控制

分支语句

• if

  score = int(input("请输入您的成绩: "))
  
  if score >= 90:
      print("您的等级为A. ")
      
  if (score >= 78) and (score < 90):
      print("您的等级为B. ")
      
      
  x, y = 7, 8
  bigger = x if x>y else y
  # bigger = 8
  

• if-else

  score = int(input("请输入您的成绩: "))
  
  if score >= 60:
      if score >= 85:
          print("优秀. ")
      else:
          print("及格. ")
  else:
      print("不及格! ")
  

• if-elif-else

  score = int(input("请输入您的成绩: "))
  
  if score >= 90:
      grade = 'A'
  elif score >= 78:
      grade = 'B'
  elif score >= 68:
      grade = 'C'
  elif score >= 60:
      grade = 'D'
  else:
      grade = 'F'
  
  print("Grade = " + grade)
  

循环语句

• while

  i = 0
  k = 0
  
  while k <= 1000:
      print("i = " + str(i))
      print("i^2 = " + str(k))
      print("-------")
      # if k == 625:
      #     break
      i += 1
      k = i ** 2
  else:
      print("While Over! ")
  

• for

  print("----字符串----")
  for i in "zifuchuan":
      print(i, end="")
  else:
      print("\nFor Over!")
  
  print("----列 表----")
  number = [1, 2, 3, 4, 5]
  for i in number:
      if i == 3:
          continue
      print(i)
  else:
      print("For Over!")
  

跳转语句

• break
• continue
• return