Parse source code into a parse tree (Parser/pgen.c) Transform parse tree into an Abstract Syntax Tree (Python/ast.c) Transform AST into a Control Flow Graph (Python/compile.c) Emit bytecode based on the Control
1. Parse source code into a parse tree (Parser/pgen.c) 2. Transform parse tree into an Abstract Syntax Tree (Python/ast.c) 3. Transform AST into a Control Flow Graph (Python/compile.c) 4. Emit bytecode based on the Control Flow Graph (Python/compile.c) 但是只知道上面还不够我们去理...
1classCodeVisitor(ast.NodeVisitor):2defvisit_BinOp(self, node):3ifisinstance(node.op, ast.Add):4node.op =ast.Sub()5self.generic_visit(node)67defvisit_FunctionDef(self, node):8print'Function Name:%s'%node.name9self.generic_visit(node)10func_log_stmt =ast.Print(11dest =None,12values =...
ast.parse(source, filename='<unknown>', mode='exec', *, type_comments=False, feature_version=None) 把源码解析为AST节点。和 compile(source, filename, mode,ast.PyCF_ONLY_AST) 等价。 If type_comments=True is given, the parser is modified to check and return type comments as specified by...
importastimportastor# 原始代码code=""" def add(a, b): return a + b """# 解析为ASTtree=ast.parse(code)# 修改ASTclassAddToSubtract(ast.NodeTransformer):defvisit_Compare(self,node):# 示例:将所有的加法替换为减法ifisinstance(node.ops[0],ast.Add):node.ops[0]=ast.Sub()returnnode ...
ast.parse(source, filename='<unknown>', mode='exec', *, type_comments=False, feature_version=None) 把源码解析为AST节点。和 compile(source, filename, mode,ast.PyCF_ONLY_AST) 等价。 If type_comments=True is given, the parser is modified to check and return type comments as specified by...
The parser module provides an interface to Python's internal parser and byte-code compiler. The primary purpose for this interface is to allow Python code to edit the parse tree of a Python expression and create executable code from this. This is better than trying to parse and modify an ...
解析器(Parser)是将程序代码转换为计算机可以理解和执行的指令的工具。在Python中,解析器的主要作用是将源代码转换为抽象语法树(Abstract Syntax Tree,AST)。 抽象语法树是一种表示程序语法结构的树状数据结构,它将源代码的语法结构以树的形式表达出来,这样解析器就可以根据这个树形结构进行进一步的分析和执行。
1. AST简介 Python官方提供的CPython解释器对python源码的处理过程如下: Parse source code into a parse tree (Parser/pgen.c) Transform parse tree into an Abstract Syntax Tree (Python/ast.c) Transform AST into a Control Flow Graph (Python/compile.c) ...
参考文章:python compiler.ast_Python Ast介绍及应用 Python官方提供的CPython解释器对python源码的处理过程如下: Parse source code into a parse tree (Parser/pgen.c) Transform parse tree into an Abstract Syntax Tree (Python/ast.c) Transform AST into a Control Flow Graph (Python/compile.c) ...