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="_")