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

Question

My framework 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?

Answer 1

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

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

Answer 2

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.

Answer 3

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)

Answer 4

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

Answer 5

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