Abstract syntax tree library ast for Python

Python's ast (Abstract Syntax Trees, abstract syntax tree) library is a module provided in the Python standard library, which can help you parse and analyze the abstract syntax tree of code in Python. The abstract syntax tree is a tree structure representing the code structure, which can help you analyze the structure of the code, extract code information and perform code refactoring, etc.

Here are some key features of the ast library:

Parsing Python code The abstract syntax tree
ast library provides the ast.parse() method, which can parse Python code into an abstract syntax tree. The parsed abstract syntax tree is a Python object that can be easily traversed and analyzed.

Analyzing the abstract syntax tree
The ast library provides many methods and classes that can easily traverse and analyze the abstract syntax tree. You can use these methods and classes to extract code information, perform code refactoring, generate code, and more.

Generating Python code
The ast library provides the ast.dump() and ast.unparse() methods to convert an abstract syntax tree into Python code. Using these methods, you can easily convert the abstract syntax tree into Python code, and perform operations such as code generation.

Support for Python 2 and Python 3
The ast library can be used in Python 2 and Python 3, and provides corresponding version support.

The following is a sample code that uses the ast library to parse Python code and output an abstract syntax tree

import ast

# 定义 Python 代码
code = """
def foo(x, y):