reidai7_5.py

# ここに関数is_primeを定義する

def primes(start, end):
    for num in range(start, end+1):
        if num < 2:
            mark = "x"
        elif is_prime(num):
            mark = "o"
        else:
            mark = "x"
        print(f"{num} {mark}")

primes(10, 20)

# 例題7.5