12345678910111213141516171819202122#!usr/bin/python#-*-coding:utf-8-*-#file:sum_number.py"""求和"""def sumner(n):if **instance(n,int):m=n+1 sum_num=0 for i in range(1,m):sum_num+1.0/(i*(i+1))*(pow(-1,i)...
def input_1(): a=raw_input('please input something:\n') global st st=l**t(a) print 'now the l**t you just inputted **:\n',st success=true while success: input_1() for i in st: c=st.count(i) if c>=3...