我正在嘗試編寫一個(gè)代碼片段，請(qǐng)求用戶輸入一個(gè) strings然后輸入一個(gè) substring ss。ss然后程序必須計(jì)算in出現(xiàn)的次數(shù)s。例如，如果用戶輸入s = ‘a(chǎn)zcbobobegghakl’and ss = ‘bob’，則程序應(yīng)打?。?Number of times bob comes is: 2。到目前為止，這是我的代碼：def count(s,ss):    Occurrence = 0    if ss in s :        for ss in s :            Occurrence += 1    return Occurrence #Main program :     s = str(input("Choose a string: "))    ss = str(input("Choose a substring:"))     print ("Number of times " + str(ss) + " occurs is : " + str(count(s,ss)) ) 我想要的輸出是這樣的：Choose a string: hellohelChoose a substring:helNumber of times hel occurs is : 2但我得到的是這個(gè)：Choose a string: hellohelChoose a substring:helNumber of times hel occurs is : 8那么有人可以幫我修改這段代碼以提供所需的輸出嗎？提前致謝