str = 'python is number 1'
print(str)

str = 'python is number 1'#输出python is number 1
str_0 = str[0]            #输出p
str_1 = str[1]            #输出y
str_2 = str[-1]           #输出1
str_3 = str[2:5]          #输出第2到第5个字符：tho
str_4 = str[:7]           #从第0个字符输出到第七个字符：python
str_5 = str[9:]           #从第9个字符一直输出到最后一个字符：number 1

int i;
    char a[] = "c is number 1";
    for (i = 0; i<=7; i++)
        putchar(a[i]);
    }

str = 'python is number 1'
str_1 = 'c is number 1'
str_2 = ' or '
str_3 = "?"
str = str + str_2 + str_1 + str_3
print(str)