[Repoze-dev] [issue142] Chameleon does not understand Python list comprehension

[Chris McDonough]

Chris McDonough  added the comment:

This got fixed in SVN by Malthe today.

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status: unread -> resolved

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Re: [Repoze-dev] [issue142] Chameleon does not understand Python list comprehension

[Tres Seaver]

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Chris McDonough wrote:
> On 3/16/10 3:36 PM, Charlie Clark wrote:
>> Am 16.03.2010, 20:12 Uhr, schrieb Adam Hutton:
>>
>>> In this example, c.facility_housing is a list of objects
>>> (SQLAlchemy-created)
>>> which have an attribute '.housing' that is a string.
>>> @@ PYTHON
>> ', '.join([housing_type.housing for housing_type in
>> c.facility_housing])
>>> u'Assisted Living, Independent Living'
>>> @@ Chameleon Page Template
>>> 
>> Do list comprehensions count as statements?
> 
> Yes.  Basically anything that doesn't do a variable assignment or uses 
> something like "print" can be part of a statement.

'expressions' are things that have values;  'statements' (like print in
Python2, or assignments) don't.


Tres.
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Tres Seaver  +1 540-429-0999  tsea...@palladion.com
Palladion Software   "Excellence by Design"http://palladion.com
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Re: [Repoze-dev] [issue142] Chameleon does not understand Python list comprehension

[Chris McDonough]

On 3/16/10 3:36 PM, Charlie Clark wrote:
> Am 16.03.2010, 20:12 Uhr, schrieb Adam Hutton:
>
>> In this example, c.facility_housing is a list of objects
>> (SQLAlchemy-created)
>> which have an attribute '.housing' that is a string.
>> @@ PYTHON
> ', '.join([housing_type.housing for housing_type in
> c.facility_housing])
>> u'Assisted Living, Independent Living'
>> @@ Chameleon Page Template
>> 
>
> Do list comprehensions count as statements?

Yes.  Basically anything that doesn't do a variable assignment or uses 
something like "print" can be part of a statement.

- C
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Re: [Repoze-dev] [issue142] Chameleon does not understand Python list comprehension

[Charlie Clark]

Am 16.03.2010, 20:12 Uhr, schrieb Adam Hutton :

> In this example, c.facility_housing is a list of objects  
> (SQLAlchemy-created)
> which have an attribute '.housing' that is a string.
> @@ PYTHON
 ', '.join([housing_type.housing for housing_type in  
 c.facility_housing])
> u'Assisted Living, Independent Living'
> @@ Chameleon Page Template
> 

Do list comprehensions count as statements? In any case I wouldn't like to  
see this amount of Python code in a template.

Charlie
-- 
Charlie Clark
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Clark Consulting & Research
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D- 40215
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[Repoze-dev] [issue142] Chameleon does not understand Python list comprehension

[Adam Hutton]

New submission from Adam Hutton :

I'm using Chameleon 1.1.1 and Pylons 0.9.7.

In this example, c.facility_housing is a list of objects (SQLAlchemy-created)
which have an attribute '.housing' that is a string.

@@ PYTHON
>>> ', '.join([housing_type.housing for housing_type in c.facility_housing])
u'Assisted Living, Independent Living'

@@ Chameleon Page Template


@@ ERROR
NameError: housing_type

@@FAILING TEST
@@ (note: I've never written a test before so apologies for any errors in the
test-writing)
Tack this onto one of the existing doc tests:

List Comprehension
---

An issue was observed where list comprehension notation resulted
in a NameError unless the iterator was already defined.

  >>> print render("""\
  ... http://www.w3.org/1999/xhtml";
  ...  xmlns:tal="http://xml.zope.org/namespaces/tal";>
  ...  
  ... """)
  http://www.w3.org/1999/xhtml";>
   0-1-2-3-4-5
  

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messages: 387
nosy: adamhutton
priority: bug
status: unread
title: Chameleon does not understand Python list comprehension

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