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Annotates a Python AST with the scope of symbols.

Project description


This package is an implementation of Python's lexical scoping rules. It's interface is simple, you pass in an AST object to the annotate function, and it provides a mapping from each node in the tree that represents a symbol to the containing scope.

Example Usage

Let's say you have the code

code = """
def f():
    x = 3
    lambda z: theta
    return x + y

and you want to determine which global variables are referenced by it. All you need to do is run

import ast
import ast_scope
tree = ast.parse(code)
scope_info = ast_scope.annotate(tree)
global_variables = sorted(scope_info.global_scope.symbols_in_frame)

Once you have executed this code, global_variables will be bound to ['f', 'theta', 'y'].

Project details

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