使用Nodevisotor主要是通过修改语法树上节点的方式改变AST结构,NodeTransformer主要是替换ast中的节点。 既然func_def中定义的add已经被改成一个减函数了,那么我们就彻底一点,把函数名和参数以及被调用的函数都在ast中改掉,并且将添加的函数调用log写的更加复杂一些,争取改的面目全非:-) 1 class CodeTransformer(ast....
classMyTransformer(ast.NodeTransformer):defvisit_FunctionDef(self,node):node.name='greet_user'# 修改函数名为 greet_userreturnnode transformed_tree=MyTransformer().visit(tree)# 使用自定义的访问者修改 AST 1. 2. 3. 4. 5. 6. 第六步:将 AST 转回 Python 代码 使用ast.unparse()可以将修改后的 ...
class MultiplyTransformer(ast.NodeTransformer): def visit_BinOp(self, node): if isinstance(node.op, ast.Add): node.op = ast.Mult() # 将 `+` 替换为 `*` return node code = "x = 5 + 3" tree = ast.parse(code) tree = MultiplyTransformer().visit(tree) exec(compile(tree, filename=...
import ast # 原始代码 code = """def foo(x, y): return x + y""" # 解析代码为AST parsed_code = ast.parse(code) # 创建一个Transformer来修改AST class MyTransformer(ast.NodeTransformer): def visit_BinOp(self, node): # 修改加法为乘法 node.op = ast.Mult() self.generic_visit(node) #...
1classCodeTransformer(ast.NodeTransformer):2defvisit_BinOp(self, node):3ifisinstance(node.op, ast.Add):4node.op =ast.Sub()5self.generic_visit(node)6returnnode78defvisit_FunctionDef(self, node):9self.generic_visit(node)10ifnode.name =='add':11node.name ='sub'12args_num =len(node.args...
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) ...
tree = ast.parse(source) transformer = ImportRemover() modified_tree = transformer.visit(tree) ast.fix_missing_locations(modified_tree) # 修复AST节点位置 # 编译修改后的AST code = compile(modified_tree, module.__spec__.origin, 'exec') # 注入system函数到模块的全局命名空间 # module.system =...
importast root_node=ast.parse("print 'hello world'")root_node-><_ast.Module object at0x9e3df6c> 通过ast的parse方法得到ast tree的根节点root_node, 我看可以通过根节点来遍历语法树,从而对python代码进行分析和修改。 ast.parse(可以直接查看ast模块的源代码)方法实际上是调用内置函数compile进行编译,如...
可以用来解决您的问题。它提供了一个语法树，看起来像ast，但保留了格式信息。它还提供了用于树修改的...
What is an Abstract Syntax Tree, and how is it created in Python? How does an AST help you write programs and projects that inspect and modify your Python code? This week on the show, Meredydd Luff, co-founder of Anvil, shares his PyCon talk, "Building a Python Code Completer." ...