day05-Python运维开发基础(双层循环、pass/break/continue、for循环)

# ### 双层循环练习

# 十行十列小星星
j = 0
while j<10:

    # 逻辑代码写在下面
    # 打印一行十个小星星
    i = 0
    while i<10:
        print("*",end="")
        i+=1

    # 打印换行
    print()

    j+=1

# 十行十列隔列换色小星星
j = 0
while j<10:
    # 打印星星
    i= 0
    while i<10:
        if i % 2 == 0:
            print("★",end="")
        else:
            print("☆",end="")
        i+=1
    # 打印换行
    print()

    j+=1

# 十行十列隔行换色小星星
"""j动的慢,i动的快,外面循环动一次,里面循环动10次"""
j = 0
while j<10:
    # 打印星星
    i= 0
    while i<10:
        if j % 2 == 0:
            print("★",end="")
        else:
            print("☆",end="")
        i+=1
    # 打印换行
    print()

    j+=1

"""
j = 0  j % 2 ★★★★★★★★★★
j = 1  j % 2 ☆☆☆☆☆☆☆☆☆☆
...
依次类推
"""

# 99乘法表
"""   '%d*%d=%2d' % (值1,值2,值3) 字符串的格式化  """
# 方向一 (正序 1~9)
i = 1
while i<=9:

    j = 1
    while j<=i:
        # print(i,j)
        # 打印对应的表达式
        print("%d*%d=%2d " % (i,j,i*j) , end="" )
        j+=1

    # 打印换行
    print()

    i+=1

# 方向二 (倒序 9~1)
print("<============>")
i = 9
while i>=1:

    j = 1
    while j<=i:
        # print(i,j)
        # 打印对应的表达式
        print("%d*%d=%2d " % (i,j,i*j) , end="" )
        j+=1

    # 打印换行
    print()

    i-=1

print(",=============.")
# 方向三
i = 1
while i<=9:

    # (1)打印空格 (8 ~ 1)
    k = 9 - i
    while k>0:
        print("       ",end="")
        k-=1

    # (2)打印星星
    j = 1
    while j<=i:
        # print(i,j)
        # 打印对应的表达式
        print("%d*%d=%2d " % (i,j,i*j) , end="" )
        j+=1

    # (3)打印换行
    print()

    i+=1

print("<====================>")
# 方向四
i = 9
while i>=1:

    # (1)打印空格 (8 ~ 1)
    k = 9 - i
    while k>0:
        print("       ",end="")
        k-=1

    # (2)打印星星
    j = 1
    while j<=i:
        # print(i,j)
        # 打印对应的表达式
        print("%d*%d=%2d " % (i,j,i*j) , end="" )
        j+=1

    # (3)打印换行
    print()

    i-=1

# 求吉利数字100 ~ 999  123 321 111 222 333 ...  666 888 567  765
"""
765
// 可以取到一个数高位
%  可以取到一个数低位

个位: 765 % 10  => 5
十位: 765 // 10 % 10 => 6
百位: 765 // 100 => 7
"""

# 方法一:
i = 100
while i<=999:
    # 个位
    gewei = i % 10
    # 十位
    shiwei = i // 10 % 10
    # 百位
    baiwei = i // 100
    # print(baiwei,shiwei,gewei)

    # 555 666  777
    if shiwei == gewei and  shiwei == baiwei:
        print(i)
    # 567 789
    elif shiwei == gewei - 1 and  shiwei == baiwei + 1:
        print(i)
    elif shiwei == gewei + 1 and  shiwei == baiwei - 1:
        print(i)

    i+=1

# 方法二
print("<=====================>")
"""
strvar = "789"
strvar[0]
strvar[1]
strvar[-1]
"""
i = 100
while i<=999:
    num = str(i)
    # 个位
    gewei = int(num[-1])
    # 十位
    shiwei = int(num[-2])
    # 百位
    baiwei = int(num[-3])

    # 555 666  777
    if shiwei == gewei and  shiwei == baiwei:
        print(i)
    # 567 789
    elif shiwei == gewei - 1 and  shiwei == baiwei + 1:
        print(i)
    # 765
    elif shiwei == gewei + 1 and  shiwei == baiwei - 1:
        print(i)

    i+=1

# 百钱买百鸡 公鸡,母鸡,小鸡,公鸡1块钱一只,母鸡3块钱一只,小鸡是5毛钱一只,问100块钱买100只鸡,有多少种买法
"""
穷举法:一个一个试
a = [1,2]
b = [3,4]
c = [5,6]

a+b+c = 10?
1 + 3 + 5 = 9
1 + 3 + 6 = 10 ok
1 + 4 + 5 = 10 ok
1 + 4 + 6 = 11

2 + 3 + 5 = 10 ok
2 + 3 + 6 = 11
2 + 4 + 5 = 11
2 + 4 + 6 = 12

公鸡 : x
母鸡 : y
小鸡 : z
# 100只
x+y+z = 100
# 100块
x+3y+0.5z = 100
通过and 把两个条件拼接在一起
"""
x = 0
count = 0
while x<=100:

    y = 0
    while y<=33:    

        z = 0
        while z<=100:

            if (x+y+z == 100) and (x+3*y+0.5*z == 100):
                count+=1
                print(x,y,z)
            z+=1

        y+=1

    x+=1
print(count)

双层循环 示例代码

# ### pass  break continue 关键字的使用

# 1.pass 过 作代码的占位
"""
if 10 % 2 == 0:
    pass

while True:
    pass
"""
# 2.break 终止当前循环 [只能是循环当中]
# 打印1~10 遇到5就终止
i = 1
while i<=10:
    if i == 5:
        break
    print(i)

    i+=1

i = 1
while i<=3:
    j = 1
    while j<=3:
        if j == 2:
            break
        print(i,j)
        j+=1
    i+=1

# break 必须使用在循环当中
"""
if 5 == 5:
    break
"""

# 3.continue 跳过当前循环,从下一次循环继续执行
# 1~10 除了5
i = 1
while i<=10:
    if i == 5:
        i+=1  # 务必自己手动加1,防止死循环
        continue
    print(i)
    i+=1

# 4.打印1~100 除了含有4的数字
"""
// 可以获取一个数的高位
%  可以获取一个数的低位
56 // 10 5
56 %  10 6
"""

print("<====1====>")
# 方法一
i = 1
while i<=100:
    if i // 10 == 4 or i % 10 == 4:
        i+=1  # 手动加上自增加1,避免死循环
        continue

    print(i)

    i+=1

print("<====2====>")
# 方法二
i = 1
while i<=100:
    str_num = str(i)
    # print(str_num,type(str_num))
    if "" in str_num:
        i+=1
        continue
    print(i)

    i+=1
    

pass_break_continue 示例代码

# ### for in 循环

# 遍历 循环 迭代 把容器里的数据统统获取出来
"""
listvar = ["a","b",1,2]
# listvar[0]
# listvar[1]
# listvar[2]
# listvar[3]
i = 0
while i<len(listvar):
    res = listvar[i]
    print(res)

    i+=1
"""

# while循环在遍历数据时,存在局限性,所以for循环应用而生
"""
# while 的局限性
i = 0
setvar = {"a","b","c","d"}
while i<len(setvar):
    res = setvar[i]
    print(res)

    i+=1
"""
"""
for 变量 in 可迭代性数据:
    code1
    code2...
可迭代性数据 : (容器类型数据 , range对象 , 迭代器)
"""

# 遍历字符串
container = "有时候,打败你的仅仅是一个微笑,比如,趴在门外的班主任"
# 遍历列表
container = ["黄俊伟","续送课","王启军","宗永玲","刘守乱"]
# 遍历元组
container = ("黄俊伟","续送课","王启军","宗永玲","刘守乱")
# 遍历集合
container = {"黄俊伟","续送课","王启军","宗永玲","刘守乱"}
# 遍历字典 (遍历字典时,遍历的是键)
container = {"top":"the shy","middle":"肉鸡","bottom":"杰克love"}

for i in container:
    print(i)

# 变量的解包
a,b = 1,2
a,b = [3,4]
a,b = "pu"
a,b = {"a1":1,"b1":2}
a,b,c = ["王健林","王思聪","王美丽"]
print(a,b,c)

# 遍历等长的二级容器
listvar = [ ["王健林","王思聪","王美丽"] , ("马云","马思聪","马文") , ("王宝强","马蓉","宋小宝")]

"""
for i in listvar:
    for j in i:
        print(j)
"""
# 优化:利用变量的解包
for a,b,c in listvar:
    # a,b,c = ["王健林","王思聪","王美丽"]
    print(a,b,c)

# 遍历不等长的二级容器
listvar = [ ["王健林","王思聪","王美丽"] , ("马云","马思聪") , ("王宝强",)]

for i in listvar:
    # print(i)
    for j in i:
        print(j)

# range对象 : 用来遍历数据
"""
range(start,end,step)
start:开始值
end  :结束值
step :步长
"""
# range  括号中只有一个值的情况  0~4
for i in range(5):
    print(i)

# range  括号中只有二个值的情况  1~7
for i in range(1,8):
    print(i)

# range  括号中只有三个值的情况
# 正序
for i in range(1,15,2):
    print(i)
# 倒序
for i in range(10,1,-1):
    print(i)

# while写法
i = 1
while i<=9:
    j = 1
    while j<=i:
        print("%d*%d=%2d " % (i,j,i*j) ,end="" )
        j+=1

    print()
    i+=1
# for 写法
for i in range(1,10):
    for j in range(1,i+1):
        print("%d*%d=%2d " % (i,j,i*j) ,end="" )
    print()
"""
while 一般用在复杂逻辑操作
for   一般用在遍历数据操作
但是他们之间有共同之处;
"""

for循环 示例代码