使用Python判断质数(素数)的简单方法讲解

import math 

def isPrime(n): 
  if n <= 1: 
  return False 
  for i in range(2, int(math.sqrt(n)) + 1): 
  if n % i == 0: 
    return False 
  return True 

from math import sqrt 
N = 100 
[ p for p in  range(2, N) if 0 not in [ p% d for d in range(2, int(sqrt(p))+1)] ] 

from itertools import count 
def isPrime(n): www.jb51.net
  if n <= 1: 
    return False 
  for i in count(2): 
    if i * i > n: 
      return True 
    if n % i == 0: 
      return False 

def isPrime(n): 
  if n <= 1: 
    return False 
  i = 2 
  while i*i <= n: 
    if n % i == 0: 
      return False 
    i += 1 
  return True 

def isPrime(n): 
  if n <= 1: 
    return False 
  if n == 2: 
    return True 
  if n % 2 == 0: 
    return False 
  i = 3 
  while i * i <= n: 
    if n % i == 0: 
      return False 
    i += 2 
  return True 

#!/usr/bin/python

L1=[]
for x in xrange(20001,40001):
 n = 0
 for y in xrange(1,x+1):
 if x % y == 0:
  n = n + 1
 if n == 2 :
 print x
 L1.append(x)
print L1

20011
20021
20023
20029
20047
20051
20063
20071
20089
20101
20107
20113
20117
20123
20129
20143
20147
20149
20161
20173
….