能组成几个单词

题目：（自己完成的）

输入一串字符串，计算看是不是包含f,r,i,e,n,d 并计算能组成 几个friend      

myStr = input("请输入一串字符串：")
num_f = num_r = num_i = num_e = num_n = num_d = 0
n=0;
#字典的值可以是变量
friend_dic ={'f':num_f, 'r':num_r, 'i': num_i, 'e':num_e, 'n':num_n, 'd':num_d}


for i in ['f', 'r', 'i','e', 'n','d']:
    for j in myStr:
        if i == j:
            friend_dic[i] += 1     #要用[]，不要用()
n = friend_dic["f"]
for i in ['f', 'r', 'i','e', 'n','d']: 
    if n > friend_dic[i]:
        n = friend_dic[i]
print("一共有能组成%d个 %s" % (n, "friend"))

版本2.0

print("判断里面一字符串，里面的单词能组成几个'friend'")
print( "*" * 50)
myStr = input("请输入一串字符串： ")

count = len(myStr) // 5
for f in "friend":
    newCount = 0
    for s in myStr:
        if f == s:
            newCount += 1
    if count > newCount:
        count = newCount
print("能组成%d 个friend" % ( count))

版本3.0