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python課堂實驗(6)

第6次實驗

1、計算1000以內的所有完數個數和

n = 0
for i in range(1,1001):
    s = 1
    for j in range(2,i):
        if i%j == 0:
            s = s + j
    if s == i:
        n = n+i
print('1000以內共有{}個完數'.format(n))

2、區間素數和

def lsPrime(n):
    for i in range(2,n-1):
        if n%i==0:
            return False
        return True

m,n 
= eval(input('請輸入整數m:')),eval (input('請輸入整數n:')) c = 0 for i in range(m,n+1): if IsPrime(i): c = c+i print('範圍在[{},{}的素數和為{}'.format(m,n,c))

3、

1)定義函式def f_write:用隨機函式生成10行資料,每行資料個數3到8個不等,每個整數範圍為[-50,50]。資料儲存為data.txt

import random
random.seed(1000)
def f_write():
    a = open("data.txt",'w'
) for i in range(10): s = random.randint(3,9) for j in range(s): a.write(str(random.randint(-50,50))) if j == s-1: a.wrte('\n') else: a.write(',') a.close

2)定義函式def f_read(),用read函式求檔案data.txt中全部數字的最大值,並輸出

def f_read()
    max1 = 0   
    a = open("data.txt
",'r') for i in range(10): str = f.readline() num = str.split('') for j in num: if int(j)>max1: max1 = int(j) print('數字最大值',max1) f.close()

3)用readlines求每行數字和的最大值

def f_readlines():
    f = open('data.txt','r')
    maxn=0
    line = f.readlines()
    for str in line:
        num=str.split('')
        sum=0
        for j in num:
            sum=sum+int(j)
        if maxn<sum:
            maxn=sum
    print"每行和最大值",maxn)

4、下載附件,每行有3個整數(有負數)。編寫程式,讀入所有資料,如果某行的三個整數能構成三角形則計算其面積,輸出所有面積的最大值(保留兩位小數)及三個邊長的值。若三角形三邊長分別為a,b,c,計算p=(a+b+c)/2,則該三角形的面積的平方=p*(p-a)*(p-b)*(p-c)。

f = open('整數.txt','r')
count=0
a,b,c,max= 0,0,0.0
for line in f:
    line=line.replace('\n','')
    d=line.split(',')
    if len(d)==3:
        x=eval(d[0])
        y=eval(d[1])
        z=eval(d[2])
        if x>0 and y>0 and z>0 and x+y>z and x+z>y and y+z>x:
             p=(x+y+z)/2
            s=(p*(p-x)*(p-y)*(p-z))**0.5
            if s>max:
                max=s
                a,b,c=x,y,z
f.close()

5、

f=open("階乘.txt","w")
t=1
for i in range(1,101):
    t = t*i
    f.write('str(i)+"!="+str(t)+"\n")
f.close()