Python流程控制

1、if条件选择

# coding:utf-8 # Time:2022/6/28 20:57 # Author:Yang Xiaopeng num = 23 if num>2: print("dayu") if num<2: print("xiaoyu") ## if else if num>10: print("D") else: print("A") ## if elif else if num < 10: print("D") elif num < 20: print("C") elif num < 30: print("B") else: print("A") ## if 嵌套 if num > 10: if num>20: if num >30: print("A") else: print("B") else: print("C") else: print("D")

2、for循环

# coding:utf-8 # Time:2022/6/28 20:57 # Author:Yang Xiaopeng for i in (1,2,3,4,5,6,7,8): if i < 8: print(i,end="____") else: print(i) list1 = [1,2,3,4,5,6] for item in list1: if item / 2 == 1: print(item) for item in "asjhlafjhkllsadk": if item == 'k': print(item) else: print(item,end="_")

3、while循环

# coding:utf-8 # Time:2022/6/28 20:57 # Author:Yang Xiaopeng # 死循环 """ while True: pass """ num = 1 while num<10: print(num,end="_") num+=1

4、break 及 continue

• break: 结束循环
• continue 退出本轮循环，继续下一轮循环

# coding:utf-8 # Time:2022/6/28 20:57 # Author:Yang Xiaopeng num = 0 while num<10: num += 1 if num <=6: continue print(num, end="_") print("") num =0 while num<10: num = num + 1 if num == 6: break print(num, end="_")