目录
1、if条件选择
# coding:utf-8
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 # 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 # 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
# 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="_")
