[Python-Dev] add new lambda syntax

Fri, 28 Jun 2013 09:01:01 -0700 

I want use coffeescript function syntax to write python lambda expression
so I modified the Grammar file.

```
atom: ('(' [yield_expr|testlist_comp|vararglist] ')' |
       '[' [testlist_comp] ']' |
       '{' [dictorsetmaker] '}' |
       NAME | NUMBER | STRING+ | '...' | 'None' | 'True' | 'False')
trailer: '(' [arglist] ')' | '[' subscriptlist ']' | '.' NAME | '->' text
```

but when I write
```
(x,y=1)->x+y
```
the parser doesn't go into vararglist.

any help?

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