[python]编程题小代码

100以内奇数的和

sum =0

n =99

while n>0 :

sum =sum+n

n =n-2

print(sum )

打字符题

h =int(input("请输入你想打印的行数:"))

n = 1

while n <h :

print(n*'*')

n +=1

等腰三角形

layer = int(input("请输入你要打印的行数："))

for i in range(1,layer+1):

spce_num = layer -i

for j in range(0,spce_num):

print(" ",end="")

star_num = 2*i-1

for j in range(0,star_num):

print("*",end=""）

print(" ")

对称的等腰三角形

layer = int(input("请输入你打印的层数;"))

for i in range(1,layer+1):

spce_num =layer -1

for i in range(0,star_num):

print(" ",end="")

star_num = 2*1-1

for j in range(0,star_num):

print(" ",end ="")

print("")

while layer % 2 == 0 :

layer = int(input("请输入正确的打印的行数，注意是奇数:"))

for i in range(1,layer// 2+3):

spce_num = layer-1

for i in range(0,spce_num):

print(" ",end="")

star_num = 2*i-1

for j in range(0,star_num):

print("*",end="")

print("")

for i in range(layer//2,0,-1):

spce_num =layer -i

for j in range(0,spce_num):

print(" ",end="")

star_num = 2*i-1

for i in range(0,star_num):

print("*",end="")

print("")

计数排序

arr =[7,3,2,0,3,2,1,6]

max_num =arr[0]

min_num =arr[0]

for num in arr:

if num>max_num:

max_num =num

elif num<min_num:

min_num =num

offest = min_num

len_arr1 =max_num - min_num +1

arr1 =[0]*len_arr1

arr2 =[0]*len(arr)

for num in arr:

print(num)

arr1[num-offest]+=1

print(arr1)

index=0

for i in range(0,len_arr1):

for j in range(0,arr1[i]):

arr2[index] = i+offest

index +=1

print()

print(arr2)

交换变量

num1 = int(input("请输入第一个数:"))

num2 = int(input("请输入第二个数:"))

#方法一：使用中间变量

temp = num1

num1 = num2

num2 = temp

print("交换后,num1 = %s num2 = %s"%(num1,num2))

#方法二：求和法

num1 = num1 + num2

num2 = num1 - num2

num1 = num1 - num2

print("交换后,num1 = %s num2 = %s"%(num1,num2))

#方法三：以后交换法（python独有的）寄存器

num1,num2 = num2,num1

print("交换后,num1 = %s num2 =%s"%(num1,num2))