[Python-Dev] Tuple pack/unpack and the definition of AST Assign nodes (original) (raw)
Thomas Lee tom at vector-seven.com
Mon Jun 9 16:21:14 CEST 2008
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Nick Coghlan wrote:
I haven't looked at that code recently, but I believe the ADSL sequence in the assignment node is for statements where there are actually multiple assignment targets, such as: >>> p = x, y = 1, 2 >>> p, x, y ((1, 2), 1, 2) Cheers, Nick. Ah I see. A quick test verifies exactly this:
>>> import _ast
>>> ast = compile("p = x, y = 1, 2", "<string>", "exec", _ast.PyCF_ONLY_AST) >>> ast.body[0] <_ast.Assign object at 0xb7d0122c> >>> ast.body[0].targets [<_ast.Name object at 0xb7d0124c>, <_ast.Tuple object at 0xb7d0128c>] >>> ast.body[0].value <_ast.Tuple object at 0xb7d0132c> >>>
I thought this would have been implemented as nested Assign nodes, but I'm obviously wrong. :) Thanks for the clarification.
Cheers, T
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