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| References | (2 earlier) <3533816.ZYnZ2OzjCs@PointedEars.de> <mailman.51.1426995416.10327.python-list@python.org> <3971951.908YQu3oQO@PointedEars.de> <mailman.52.1426997516.10327.python-list@python.org> <1504323.jUKfeKbQsP@PointedEars.de> |
|---|---|
| From | Ian Kelly <ian.g.kelly@gmail.com> |
| Date | 2015-03-25 23:09 -0600 |
| Subject | Re: A simple single line, triple-quoted comment is giving syntax error. Why? |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.181.1427346636.10327.python-list@python.org> (permalink) |
On Wed, Mar 25, 2015 at 10:35 PM, Thomas 'PointedEars' Lahn
<PointedEars@web.de> wrote:
> Chris Angelico wrote:
>
>> On Sun, Mar 22, 2015 at 2:49 PM, Thomas 'PointedEars' Lahn
>> <PointedEars@web.de> wrote:
>>>> Implicit concatenation is part of the syntax, not part of the expression
>>>> evaluator.
>>> Reads like nonsense to me.
>>
>> What do you mean?
>
> As I showed, string literals and consecutive tokens of string literals
> (“STRING+”) so as to do implicit concatenation *are* expressions of the
> Python grammar. Expressions are *part of* the syntax of a programming
> language.
>
> Perhaps you mean that the time when implicit concatenation is evaluated
> (compile time) differs from the time when other expressions are evaluated
> (runtime). But a) whether that is true depends on the implementation and
> b) there can be no doubt that either expression needs to be evaluated. So
> whatever you mean by “expression evaluator” has to be able to do those
> things.
>
> Which makes the statement above read like nonsense to me.
What the grammar that you quoted from shows is that STRING+ is an
expression. The individual STRINGs of a STRING+ are not expressions,
except to the extent that they can be parsed in isolation as a
STRING+. By the same token, a STRING+ is a single string literal, not
an aggregate of several.
Ancillary data point:
>>> help(ast.literal_eval)
Safely evaluate an expression node or a string containing a Python
expression. The string or node provided may only consist of the following
Python literal structures: strings, bytes, numbers, tuples, lists, dicts,
sets, booleans, and None.
>>> ast.literal_eval('"foo" "bar"')
'foobar'
So the ast.literal_eval also treats this as one literal expression.
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Re: A simple single line, triple-quoted comment is giving syntax error. Why? Laurent Pointal <laurent.pointal@laposte.net> - 2015-03-18 19:04 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Laurent Pointal <laurent.pointal@laposte.net> - 2015-03-18 19:06 +0100
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Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-18 20:56 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Terry Reedy <tjreedy@udel.edu> - 2015-03-18 17:47 -0400
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Re: A simple single line, triple-quoted comment is giving syntax error. Why? Igor Korot <ikorot01@gmail.com> - 2015-03-18 14:45 -0400
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Re: A simple single line, triple-quoted comment is giving syntax error. Why? Denis McMahon <denismfmcmahon@gmail.com> - 2015-03-19 00:53 +0000
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-22 04:14 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Chris Angelico <rosuav@gmail.com> - 2015-03-22 14:36 +1100
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Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-26 05:35 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-25 23:09 -0600
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Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-29 01:56 -0600
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-29 12:41 +0200
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-31 01:23 -0600
Re: A simple single line, triple-quoted comment is giving syntax error. Why? sohcahtoa82@gmail.com - 2015-03-31 16:10 -0700
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Chris Angelico <rosuav@gmail.com> - 2015-04-01 10:36 +1100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-31 17:43 -0600
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-04-02 23:31 +0200
Re: A simple single line, triple-quoted comment is giving syntax error. Why? sohcahtoa82@gmail.com - 2015-04-02 15:26 -0700
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-04-02 18:21 -0600
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Re: A simple single line, triple-quoted comment is giving syntax error. Why? Marko Rauhamaa <marko@pacujo.net> - 2015-04-03 10:13 +0300
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Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-04-03 09:25 -0600
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-04-03 00:40 -0600
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-03-27 11:43 +1300
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-28 19:06 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-26 12:32 -0600
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-26 19:56 +0100
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Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-26 19:38 -0600
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