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RSS订阅原创 树（Tree）数据抽象
定义： A tree has a root label and a sequence of branches. Each branch of a tree is a tree. A tree with no branches is called a leaf. Any tree contained within a tree is called a sub-tree of that tree (such as a branch of a branch). The root of each sub-tree
2020-06-24 18:50:29
571
原创 Pytho中function call的执行顺序
看到一篇为文章讲的不错，主要顺序是： Evaluate operator Evaluate operand(s) Apply operator to operands a. Create a new frame b. Create arguments as local variables c. Execute the body of the function 这也解释了我第一篇文章中为什么不能用if_function替代 if else statement的问题 def if_function（c,t,
2020-06-17 20:15:47
295
原创 HW02 lambda函数的一个问题
阐述一个有关lambda函数的问题 首先定义accumulate函数 def accumulate(combiner, base, n, term): """Return the result of combining the first n terms in a sequence and base. The terms to be combined are term(1), term(2), ..., term(n). combiner is a two-argument com
2020-06-08 22:35:09
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原创 HW1 Python中call expression的执行顺序
此笔记用 个例子解释python中call的执行顺序和相关environment的知识 第一个例子来源于HW01的Q4 Q4: If Function vs Statement Let’s try to write a function that does the same thing as an if statement. def if_function(condition, true_result, false_result): """Return true_result if condi
2020-06-06 21:58:53
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