抛硬币python （效率极低）

m()

import  random
def yb(n):
    T = 0
    F = 0
    M = ["正", "反"]
    K = [0 for i in range(n)]
    for i in range(n):
        if random.choice(M) == "正":
            T += 1
            K[i] = "正"
        else:
            F += 1
            K[i] = "反"
    print(list(K))
    print("正面次数：", T, "正面概率:", T/n)
    print("反面次数：", F, "反面概率:",F/n)
    return
def m():
    print("输入硬币抛投次数：", )
    x = int(input())
    yb(x)
    return

m()