str在python的意思

# 创建一个字符串my_string = "Hello, world!"# 获取字符串长度string_length = len(my_string)# 访问第 5 个字符character = my_string[4]# 切取子字符串substring = my_string[0:5]# 连接两个字符串new_string = my_string + " It's a beautiful day."# 替换子字符串replaced_string = my_string.replace("world", "Python")