逻辑判断
if elif else
1 score= int(input('请输入学生成绩\n')) 2 if score >= 60 and score < 70: 3 print('成绩合格') 4 elif score >= 70 and score < 80: 5 print('成绩良好') 6 elif score >= 80 and score < 90: 7 print('成绩优异') 8 elif score >= 90 and score <= 100: 9 print('成绩优秀') 10 elif score < 60: 11 print('成绩不合格') 12 else: 13 print('输入成绩有误')
循环语句有两种 while true for
while True: score=int(input('请输入学生成绩\n')) if score >= 60 and score < 70: print('成绩合格') elif score >= 70 and score < 80: print('成绩良好') elif score >= 80 and score < 90: print('成绩优异') elif score >= 90 and score <=100: print('成绩优秀') elif score < 60: print('成绩不合格') else: print('输入有误请重新输入') continue
range函数 for item in range(1,10,3):#(起始位置,终止位置,步长) range(10)#指定了终止位置,起始的位置默认是0 print(item,end="") 反向 for a in range(5,-10,-1): print(a,end=" ") for item in range(20): print(item)