python的一些小练习(1)
(1)用起泡法对十个数由大到小排序,即将相邻两个数比较,将小的调到前头
input_values=input("输入十个数")
values=[int(x) for x in input_values.split( )]
for i in range(9):
for j in range(9-i):
if values[j]<values[j+1]:
t=values[j+1]
values[j+1]=values[j]
values[j]=t
print("排序后:",values)
(2)有一个4x5矩阵,编程求出其最大值及其所处的位置
import random
matrix=[[random.randint(0,100) for i in range(3)] for j in range(4)]
max=matrix[0][0]
for i in range(4):
for j in range(3):
if max<matrix[i][j]:
max=matrix[i][j]
a=i
b=j
print("该矩阵的最大值为:",max,"\n位置为第",a,"行","第",b,"列")
(3)求
sum=0
for i in range(1,21):
s = 1
for j in range(1,i+1):
s=s*j
sum=sum+s
print(sum)
(5)有一函数,写一程序,输入自变量的值,输出函数值
import numpy as np
x=float(input("输入x值:"))
y=float(input("输入y值:"))
def f(x,y):
f=x**2+np.sin(x*y)+2*y
return f
print("函数值:",f(x,y))