[Patches] [ python-Patches-1607548 ] Optional Argument Syntax

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Patches item #1607548, was opened at 2006-12-02 15:53
Message generated for change (Comment added) made by jimjjewett
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Category: Core (C code)
Group: Python 3000
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Tony Lownds (tonylownds)
Assigned to: Nobody/Anonymous (nobody)
Summary: Optional Argument Syntax

Initial Comment:
This patch implements optional argument syntax for Python 3000. The patch still has issues; I am posting so that Collin Winters can add a link to the PEP.

The syntax implemented is roughly:

def f(arg:expr, (nested1:expr, nested2:expr)) -> expr:
  suite

The function object has a new attribute, func_annotations that maps from argument names to the result of the expression. The return annotation is stored with a key of 'return'.

Lambda's syntax doesn't support annotations.

This patch alters the MAKE_FUNCTION opcode. I have an implementation that built the func_annotations dictionary in bytecode as well but it was bigger and slower.


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Comment By: Jim Jewett (jimjjewett)
Date: 2006-12-11 12:29

Message:
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Could you rename it to "argument annotations"?  "optional argument" makes
me think of the current keyword arguments, that can be but don't have to be
passed.

-jJ


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Comment By: Tony Lownds (tonylownds)
Date: 2006-12-03 20:24

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This patch implements optional argument syntax for Python 3000. The patch
still has issues:
1. test_ast and test_scope fail.
2. Running the test suite after compiling the library with the compiler
package causes failures
3. no docs
4. C-code reference counts and error checking needs a review

The syntax implemented is roughly:

def f(arg:expr, (nested1:expr, nested2:expr)) -> expr:
suite

The function object has a new attribute, func_annotations that maps from
argument names to the result of the expression. The return annotation is
stored with a key of 'return'.

Lambda's syntax doesn't support annotations.

The ast format has changed for the builtin compiler and the compiler
package. A new token was added, '->' (called RARROW in token.h). token.py
lost ERRORTOKEN after re-generating, I don't know why. I added it back
manually.



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