The ast module makes it easy to handle Python abstract syntax trees in Python applications. The abstract syntax itself can change with every release of Python. Using this module will help to learn the current grammer programmatically.
To create an abstract syntax tree, pass ast. PyCF_ONLY_AST as a flag for the built-in function compile() or use the helper function parse() provided by this module. The result is a tree of objects of classes that inherit from ast.AST. Abstract syntax trees can be compiled into Python code objects using the built-in function compile().
[vagrant@localhost test]$ python --version
Python 3.5.2
[vagrant@localhost test]$ cat << 'EOF' > helloworld.py
> !#/usr/bin/env python
> # -*- coding: utf-8 -*-
>
> def main():
> print('hello, world!')
>
> if __name__ == '__main__':
> main()
> EOF
[vagrant@localhost test]$ python
Python 3.5.2 (default, Jul 28 2018, 11:25:01)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-23)] on linux
Type “help”, “copyright”, “credits” or “license” for more information.
>>> FILENAME = ‘helloworld.py’
>>> with open(FILENAME, ‘r’) as f:
… source = f.read()
File “
source = f.read()
^
IndentationError: expected an indented block
あれ、うまくいかんな。。
