目 录 ContentsContents 第1单元 进入Python乐园...............................................0011.1 认识Python .................................................................... 003 1.2 认识IDLE........................................................................ 007 1.3 编程就这么简单 .............................................................. 010 1.4 我来指挥计算机工作....................................................... 012 习题1...................................................................................... 014 第2单元 Python程序的小秘密........................................0162.1 标识符和关键字 .............................................................. 018 2.2 变量 ................................................................................ 021 2.3 注释 ................................................................................ 025 2.4 缩进 ................................................................................ 029 2.5 续行符 ............................................................................ 030 2.6 Python 之禅 .................................................................... 031 习题2...................................................................................... 032 第3单元 奇妙的数字.......................................................0343.1 整数 ................................................................................ 035 3.2 浮点数 ............................................................................ 039 3.3 真值和假值 ..................................................................... 041 3.4 空值 ................................................................................ 042 3.5 认识表达式 ..................................................................... 043 3.6 算术复合赋值运算符....................................................... 045 3.7 牛刀小试......................................................................... 046 习题3...................................................................................... 048 第4单元 字符的队伍——字符串....................................0504.1 字符串的创建.................................................................. 051 Gwxzw.indd 7 2023/2/10 9:40:01 4.2 字符串的引用 ..................................................................055 4.3 字符串的操作及常用方法 ................................................058 4.4 字符串的格式化 ..............................................................062 习题4 ......................................................................................066 第5单元 混合的队伍——列表........................................069 5.1 列表的创建与删除 ..........................................................070 5.2 列表的索引和访问 ..........................................................073 5.3 列表元素的控制 ..............................................................076 习题5 ......................................................................................081 第6单元 变身小魔术——类型转换.................................084 6.1 数字类型转换 ..................................................................086 6.2 字符类型转换 ..................................................................090 6.3 列表类型的转换 ..............................................................092 习题6 ......................................................................................094 第7单元 会画图的小海龟...............................................098 7.1 小海龟登场 .....................................................................099 7.2 我在哪儿，我是谁 ..........................................................102 7.3 拿起画笔画 .....................................................................106 习题7 ......................................................................................114 第8单元 向左转向右转——分支结构...............................116 8.1 单分支结构 .....................................................................117 8.2 双分支结构 .....................................................................121 8.3 多分支结构 .....................................................................124 8.4 分支的嵌套 .....................................................................128 习题8 ......................................................................................132 第9单元 周而复始的力量——循环结构..........................137 9.1 for循环 ...........................................................................138 9.2 while循环 .......................................................................143 9.3 改变循环的break和continue .........................................146 9.4 循环的嵌套 .....................................................................150 习题9 ......................................................................................154 第10单元 纠错小能手——异常处理.................................161 10.1 try-except语句 .............................................................164 10.2 try-except-else语句 ......................................................167 10.3 try-except-finally语句 ....................................................169 习题10 ....................................................................................173 第11单元 Python工具箱——标准函数入门.....................177 11.1 函数的使用方法 ............................................................178 11.2 标准函数的应用 ............................................................179 习题11 ....................................................................................188 附录A Python开发环境的搭建.........................................191 附录B 青少年编程能力等级标准第2部分： Python编程一级节选...........................................202 附录C 标准范围内的Python标准函数列表....................208