all Python 3astterm

ast.Attribute

expressions

The node for attribute access obj.name: the owner expression in value, the attribute name as a string in attr and the context ctx (Load, Store or Del).

Syntax

ast.Attribute(value, attr, ctx)

The attr field is a plain string, not a Name node, so a visitor with visit_Name never sees attribute names. A chain a.b.c nests from the right: the outer node is the attribute c, and its value holds the Attribute for a.b. In a.b.c = 1 only the outer node gets Store; everything inside is read with Load.

Examples

import ast
node = ast.parse('a.b.c = 1').body[0].targets[0]
print(node.attr, type(node.ctx).__name__)  # → c Store
print(node.value.attr, type(node.value.ctx).__name__)  # → b Load
print(node.value.value.id)  # → a

See also

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