QUIZ 7COMP9021 PRINCIPLES OF PROGRAMMING$ python3 quiz_7.pyEnter four integers: 0 2 2 8Here is the grid that has been generated:1 1 0 1 1 1 1 11 0 0 1 0 0 1 0Enter four integers: 3 0 4 1Will compute the number of good paths from (3, 0) to (4, 1)...Th…

构建 Polynomial 类,实现 +, -, , / and +=, -=, =, /= 参考:如何用python编程求解二元一次方程组.如x+y=3;x-y=1 参考:python对重载运算符的限制 参考:python:自定义对象的打印 operator overwrite + __add__ - __sub__ * __mul__ / __truediv__ += __iadd__ -= __isub__ *= __imul__ /= __itruediv__ 字符串打印 __str__…

Merging two strings into a third one Say that two strings s1 and s2 can be merged into a third string s3 if s3 is obtained from s1 by inserting arbitrarily in s1 the characters in s2, respecting their order. For instance, the two strings ab and cd ca…

有关yield的用法简介以及图灵机 第一节课大体没有太大变化,前半节课为了给图灵机的讲解做铺垫引入了yield.数组.字符串和文件等都是一个可迭代的对象,但由于它们的所有数据都存储与内存中,对内存的消耗过大,借此引用generator生成器,其工作原理是重复调用next()方法,直到捕获一个异常. 以yield为例,yield的功能类似于return,没迭代一次遇到yield时就返回yield后面的值,下一次迭代将会从上一次迭代遇到的yield后面的代码开始执行. 后半节课主要是对图灵机进行讲解…

参考:4. Map, Filter and Reduce — Python Tips 0.1 documentation 参考:Python的functools.reduce用法 Map:映射,对于列表的每个元素进行相同的操作 filter:筛选,筛选列表中满足某一条件的所有元素 reduce:归纳,连续操作,连加.连乘等 python 3.0以后, reduce已经不在built-in function里了, 要用它就得from functools import reduce. reduce的…

Recently I am doing the assignment of COMP9021. It is too difficult and it is about the Knight and Knave. While I tried to finish this assignment, however I only finnished the code with the testcase Professor Martin gave. I encontered a problem was t…

参考:正则表达式 - 廖雪峰 参考:Python3 正则表达式 - 菜鸟教程 参考:正则表达式 - 教程 re.match 尝试从字符串的起始位置匹配一个模式,如果不是起始位置匹配成功的话,match()就返回none. re.search 扫描整个字符串并返回第一个成功的匹配. span():返回搜索的索引区间 group():返回匹配的结果 re.sub 用于替换字符串中的匹配项. re.match只匹配字符串的开始,如果字符串开始不符合正则表达式,则匹配失败,函数返回None:而re.se…