Be my human compiler: What is wrong with this Python 2.5 code?

My framewor开发者_如何学编程k is raising a syntax error when I try to execute this code:

    from django.template import Template, TemplateSyntaxError
    try:
        Template(value)
    except TemplateSyntaxError as error:
        raise forms.ValidationError(error)
    return value

And here's the error:

    from template_field import TemplateTextField, TemplateCharField
      File "C:\django\internal\..\internal\cmsplugins\form_designer\template_field.py", line 14
        except TemplateSyntaxError as error:
                                    ^
    SyntaxError: invalid syntax

What's going on?

The alternate syntax except SomeException as err is new in 2.6. You should use except SomeException, err in 2.5.

You can't have an empty try block like that in Python. If you just want to do nothing in the block (for prototyping code, say), use the pass keyword:

from django.template import Template, TemplateSyntaxError
try:
    pass
except TemplateSyntaxError as error:
    Template(value)
    raise forms.ValidationError(error)
return value

Edit: This answers the original version of the question. I'll leave it up for posterity, but the question has now been edited, and @jleedev has the correct answer to the revised question.

You can't try nothing. If you really have nothing to try, use the pass keyword:

try:
    pass
except TemplateSyntaxError as error:
    Template(value)
    raise forms.ValidationError(error)
return value

But based on my (limited) knowledge of Django, I'd guess you want something like this instead:

try:
    return Template(value)
except TemplateSyntaxError as error:
    raise forms.ValidationError(error)

You've got nothing inside your try block. A try/except block looks like:

try:
    do_something()
except SomeException as err:
    handle_exception()

In every block in Python you should do something, or if you don't want to do something use the pass statement!