打印1000以内的质数

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def isprime(x):

    if x<2:
        flag=False
    else:
        flag = True

    for i in range(2,x):
        if x % i ==0 :
            flag = False
            break
        
    return flag

for z in range(1000):
    if isprime(z):
        print(z,end=' ')