Python實現(xiàn)高效求解素數(shù)代碼實例

#coding:utf-8 #設置python文件的編碼為utf-8，這樣就可以寫入中文注釋
def primeRange(n):
 myArray=[1 for x in range(n+1)] ##列表解析，生成長度為(n+1)的列表，每個數(shù)值都為1
 myArray[0]=0
 myArray[1]=0
 startPos=2
 while startPos <= n:
 if myArray[startPos]==1:
 key=2
 resultPos = startPos * key #可知startPos的整數(shù)倍都不是素數(shù)，設置startPos的整數(shù)倍的位置為0表示非素數(shù)
 while resultPos <= n:
 myArray[resultPos] =0
 key += 1
 resultPos = startPos *key
 startPos += 1

 resultList=[] ##將最終的素數(shù)保存在resultList列表返回
 startPos=0
 while startPos <= n:
 if myArray[startPos] == 1:
 resultList.append(startPos)
 startPos += 1
 return resultList

numString=raw_input("Input the Range(>3):")
numInt=int(numString)
if numInt <= 3:
 print "The Number Need to be greater than 3"
else:
 primeResult=primeRange(numInt)
 print "The Result is:",primeResult