python实例
#! /usr/bin python
#coding:utf-8
from __future__ import division #实现精确的除法，例如4/3=1.333333
import random
def make_score(num):
score = [random.randint(0,100) for i in range(num)]
return score
def less_average(score):
num = len(score)
sum_score = sum(score)
ave_num = sum_score/num
less_ave = [i for i in score if i<ave_num]
return len(less_ave)
if __name__=="__main__":
score = make_score(40)
print "the number of less average is:",less_average(score)
print "the every socre is[from big to small]:",sorted(score,reverse=True)
#!/usr/bin/env python
#coding:utf-8
#阿拉伯乘法
def arabic_multiplication(num1,num2):
num_lst1 = [int(i) for i in str(num1)] #将int类型的123，转化为list类型的[1,2,3]，每个元素都是int类型
num_lst2 = [int(i) for i in str(num2)]
#两个list中整数两两相乘
int_martix = [[i*j for i in num_lst1] for j in num_lst2]
#将上述元素为数字的list转化为元素类型是str，主要是将9-->'09'
str_martix = [map(convert_to_str,int_martix[i]) for i in range(len(int_martix))]
#将上述各个list中的两位数字分开：['01','29','03']-->[0,2,0],[1,9,3]
martix = [[int(str_martix[i][j][z]) for j in range(len(str_martix[i]))] for i in range(len(str_martix)) for z in range(2)]
#计算阿拉伯乘法表的左侧开始各项和
sum_left = summ_left(martix)
#计算阿拉伯乘法表的底部开始各项和
sum_end = summ_end(martix)
#将上述两个结果合并后翻转
sum_left.extend(sum_end)
sum_left.reverse()
#取得各个和的个位的数字（如果进位则加上）
result = take_digit(sum_left)
#翻转结果并合并为一个结果字符串数值
result.reverse()
int_result = "".join(result)
print "%d*%d="%(num1,num2)
print int_result
#将int类型转化为str类型，9-->'09'
def convert_to_str(num):
if num<10:
return "0"+str(num)
else:
return str(num)
#计算阿拉伯乘法表格左侧开始的各项之和
def summ_left(lst):
summ = []
x = [i for i in range(len(lst))]
y = [j for j in range(len(lst[0]))]
sx = [i for i in x if i%2==0]
for i in sx:
s=0
j=0
while i>=0 and j<=y[-1]:
s = s+ lst[i][j]
if i%2==1:
j = j+1
else:
j = j
i = i-1
summ.append(s)
return summ
#计算阿拉伯乘法表格底部开始的各项之和
def summ_end(lst):
summ=[]
y = [j for j in range(len(lst[0]))]
ex = len(lst)-1
for m in range(len(y)):
s = 0
i=ex
j=m
while i>=0 and j<=y[-1]:
s= s+lst[i][j]
if i%2==1:
j = j+1
else:
j=j
i = i-1
summ.append(s)
return summ
#得到各个元素的个位数，如果是大于10则向下一个进位
def take_digit(lst):
tmp = 0
digit_list = []
for m in range(len(lst)):
lstm = 0
lstm = lst[m]+tmp
if lstm<10:
tmp = 0
digit_list.append(str(lstm))
else:
tmp = lstm/10
mm = lstm-tmp*10
digit_list.append(str(mm))
return digit_list
if __name__=="__main__":
arabic_multiplication(469,37)