1.
#99乘法表
#第一种
for i in range(1,10):
s=''
for j in range (1,i+1):
s+=str(j)+'*'+str(i)+'='+str(j*i)+'\t'
print s
#第二种
for i in range(1,10):
s=''
for j in range (1,i+1):
s+=str(j)+'*'+str(i)+'='+'{0:2d}'.format(j*i)+'\t' #{0:2d}解释:表示0 代表j*i,:2d 表示两个宽度的10进制数显示
print s
2.#1-100的素数
num = 2
cont = 0
while num < 100:
flag = 1
i = 2
while i < num :
if num % i == 0:
flag=0
break
i=i+1
if flag == 1:
cont =cont + 1
print num
num = num + 1
print '素数的个数是%d' %(cont)
3.
#m=1*2*3*4*...n 求m为不大于20000时的最大n
m = 1
n = 1
while m <=20000:
m = m * n
n+=1
n= n-1
print n
4.#1-30内的 勾股数
for a in range (1,30):
for b in range (1,30):
for c in range(1,30):
if a * a + b * b == c *c:
print a,b,c
5.#寻找平方后三位与自身一样的数字(仅限三位数)
n = 100
while n <= 1000:
m = n * n
if m % 1000==n:
print n
n=n+1