python入门练习题

1、第一题是，给出由5、6、7、8组成的数字不重复的所有的三位数：for i in range(5,9): for j in range(5,9): for k in range(5,9): if( i != k ) and (i != j) and (j != k): print(100*i+10*j+k)

2、第二题：找出1000000以内的正整数x，使得x+100和x+168都是完全平方数：import mathfor i in range(1000000): x = int(math.sqrt(i + 100)) y = int(math.sqrt(i + 268)) if(x * x == i + 100) and (y * y == i + 268): print(i)需要加载math包。

3、输出一个图形阵列：a = 176b = 219print( chr(b)巳呀屋饔,chr(a),chr(a),chr(a),chr(b))print(chr(a),chr(b),chr(a),c茑霁酌绡hr(b),chr(a))print(chr(a),chr(a),chr(b),chr(a),chr(a))print(chr(a),chr(b),chr(a),chr(b),chr(a))print(chr(b),chr(a),chr(a),chr(a),chr(b))

4、乘法表：for i in range(1,10): for j in range(1,i+1): print("%d*%d=%2d" % (i,j,i*j),end=" ") print (" ")

5、10郏柃妒嘌^6以内有多少个素数？h = 0leap = 1;from math import sqrt;from sys import stdout;for m in range(1,1000000): k = int(sqrt(m + 1)); for i in range(2,k + 1): if m % i == 0: leap = 0; break if leap == 1 h += 1; if h % 10 == 0: print('.'); leap = 1;print ('The total is %d' % h);答案是：78499。