相关疑难解决方法(0)

Python中替换字符串中字符的最简单方法是:

text = "abcdefg";
text[1] = "Z";
           ^

我想随机大写或小写字符串中的每个字母.我是新手在python中使用字符串,但我认为因为字符串是不可变的,所以我不能执行以下操作:

i =0             
for c in sentence:
    case = random.randint(0,1)
    print("case = ", case)
    if case == 0:
        print("here0")
        sentence[i] = sentence[i].lower()
    else:
        print("here1")
        sentence[i] = sentence[i].upper()
    i += 1
print ("new sentence = ", sentence)

并得到错误:TypeError:'str'对象不支持项目分配

但那么我怎么能这样做呢？