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Annotates a Python AST with the scope of symbols.

Project description

ast_scope

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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