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