有一个列表[“python“,“computer“,“book“,“pragrame“],请编写程序统计列表中每个字母出现的次数

def countword(list):
    listcount=[]
    countnum={
    
    }
    for str in list:
        for x in str:
            listcount.append(x)
    for y in listcount:
        countnum[y]=listcount.count(y)
    print(countnum)
if __name__=="__main__":
    list=["python","computer","book","programe"]
    countword(list)

运行结果：