判断质数的代码，①处应填？（）
python复制1num = int(input()) 2is_prime = True 3if num < 2: 4 is_prime = Falsepython复制1for i in range(①, int(num**0.5)+1):,[object Object], 2if num % i == 0:,[object Object], 3is_prime = False,[object Object], 4break,[object Object],
1num = int(input()) 2is_prime = True 3if num < 2: 4 is_prime = False
1for i in range(①, int(num**0.5)+1):,[object Object], 2if num % i == 0:,[object Object], 3is_prime = False,[object Object], 4break,[object Object],
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2
num
num//2