replace('i', 'j', 1)) except ValueError: return Sym(token)def to_string(x): "Convert a Python object back into a Lisp-readable string." if x is True: return "#t" elif x is False: return "#f" elif isa(x, Symbol): return x elif isa(x, str): return '"%s"' % x.encode...
while True: val = eval(parse(raw_input(prompt))) if val is not None: print(schemestr(val))def schemestr(exp): "Convert a Python object back into a Scheme-readable string." if isinstance(exp, List): return '(' + ' '.join(map(schemestr, exp)) + ')' else: return str(exp) ...
最后,我们将要添加一个函数to_string,用来将一个表达式重新转换成Lisp可读的字符串;以及一个函数repl,该函数表示read-eval-print-loop (读取-求值-打印循环),用以构成一个交互式的Lisp解释器:1 2 3 4 5 6 7 8 9 def to_string(exp): "Convert a Python object back into a Lisp-readable string." ...
I'd like to be able to convert from any charset to clean UTF-8 in a single call (we're using PHP). It's for Apache Solr indexing; the problem is that the XML Parser Solr uses (written in Java) throws ...Python Panda.read_csv rounds to get import errors? I have a 10000 x 25...
We can use start and end indices as well while converting strings to convert part of string.Create a new source code file named main.lisp and type the following code in it.main.lispOpen Compiler (write-line (string-upcase "a big hello from tutorials point" :start 6)) ...
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I'd like to be able to convert from any charset to clean UTF-8 in a single call (we're using PHP). It's for Apache Solr indexing; the problem is that the XML Parser Solr uses (written in Java) throws ...Python Panda.read_csv rounds to get import errors? I have a 10000 x 25...
如何使用Python编写一个Lisp解释器 如何使用Python编写一个Lisp解释器 原文: Peter Norvig 译者: johnc 本文有两个目的: 一是讲述实现计算机语言解释器的通用方法，另外一点，着重展示如何使用Python来实现Lisp方言Scheme 的一个子集。我将我的解释器称之为Lispy(lis.py)。几年前，我介绍过如何使用Java编写一个...
提取图框/图签图块的DXF数据(if (= (cdr (assoc 66 dNum)) 1);判定图块是否带有属性数据 ...
用C# 编写 Windows Runtime Component导出函数。(这一步得到元数据描述文件 *.winmd。也可以直接将实现放在这一步。不喜欢 C# 的同学可以用 C++ 或 Python 代替炒饭炒饭 用Rust 构建脚本(build.rs)调用绑定生成工具。(以 元数据描述文件 *.winmd 为输入)和复制必要依赖项 ...