判断质数：
    num = int(input(“Please enter an int number (the number should bigger than one):”))
    i = 2
    # 创建一个变量，记录是否是质数，默认num是质数
    flag = True
    while i < num:
    # 如果num能被i整除，说明num不是质数
    if num % i == 0:
    # 只要num不是质数，将flag的值修改为 False
    flag = False
    i += 1

    if flag:
    print(num, ‘是质数’)
    else:
    print(num, ‘不是质数’)

    找出一定范围内的质数：
    我的：
    # 找出一定范围内的质数
    num = int(input(“Please enter a range.(the range should bigger than 1):”))
    results=[]
    for t in range(2, num):
    i = 2
    flag = True
    while i <= t:
    # 如果num能被i整除，说明num不是质数
    if t % i == 0:
    # 只要num不是质数，将flag的值修改为 False
    flag = False
    i += 1
    if flag:
    results.append(t)
    print(results)

    结果：
    Please enter a range.(the range should bigger than 1) : 3
    []

    小杨：
    # 找出一定范围内的质数
    num = int(input(“Please enter a range.(the range should bigger than 2):”))
    results = []
    for t in range(2, num):
    i = 2
    flag = True
    ①while i <= t-1:
    if t % i == 0:
    flag = False
    i = t+1
    else:
    i = i + 1
    if flag:
    results.append(t)
    print(results)

    结果：
    Please enter a range.(the range should bigger than 2): 17
    [2, 3, 5, 7, 11, 13]

    while i <= t-1:
    应该是i<=t-1 not i<=t
    如果i<=t，当i=t时，执行 if t % i == 0，进入if循环，flag=FALSE，每个数都能被自己整除，将找不到质数。