python中str的意思是

# 创建一个字符串my_string = "This is a string."# 获取字符串的长度string_length = len(my_string)# 索引字符串的第一个字符first_character = my_string[0]# 切片字符串，从第 0 个字符到第 5 个字符substring = my_string[0:5]# 连接两个字符串concatenated_string = my_string + " This is another string."