Re: Method chaining on decorator got SyntaxError
alex23 wuwe...@gmail.com wrote:
Makoto Kuwata k...@kuwata-lab.com wrote:
I'm sad about this restriction because:
@recipe.product('*.html').ingreds('$(1).rst')
def file_html(c):
# do something
is enough simple and more readable than:
@recipe.product('*.html')
@recipe.ingreds('$(1).rst')
def file_html(c):
# do something
But I'll follow the Python's philosophy.
Personally, I'd find this approach a lot clearer:
rst2html = recipe.product('*.html').ingred('$(1).rst')
@rst2html
def file_html(c):
# etc
It allows for easier reuse of your decorators and it labels it in a
way that I can understand from the name as opposed to having to
decipher the decorator method chain to work out its intent.
Or another way would be to define `recipe` such that something like this
works:
@recipe(product='*.html', ingreds='$(1).rst')
def file_html(c):
...
--
Duncan Booth http://kupuguy.blogspot.com
--
http://mail.python.org/mailman/listinfo/python-list
Re: Method chaining on decorator got SyntaxError
On 16/02/2011 23:25, Makoto Kuwata wrote:
Hi,
I have a question about decorator.
I tried the following example and got Syntax Error.
class deco(object):
def __init__(self, name):
self._name = name
def foo(self, value):
self._foo = value
return self
def __call__(self, func):
func._deco = self
return func
## ok
@deco('aaa')
def f1(): pass
## Syntax Error
@deco('aaa').foo('bbb') # SyntaxError: invalid syntax
def f2(): pass
The above code shows that Python doesn't allow method chain
on decorator syntax.
Why does this limitation exist?
I want to chain methods as a certain DSL, just like:
@recipe().product('*.html').ingreds('$(1).rst')
def file_html(c):
system(c%rst2html.py $(ingred) $(product))
If you know the reason of the restriction, let me know it.
You may want to read the discussion at:
https://groups.google.com/group/python-ideas/browse_thread/thread/1eebf486969c39a1/?hl=en
--
http://mail.python.org/mailman/listinfo/python-list
Re: Method chaining on decorator got SyntaxError
Thank you MRAB, On Thu, Feb 17, 2011 at 8:49 AM, MRAB pyt...@mrabarnett.plus.com wrote: You may want to read the discussion at: https://groups.google.com/group/python-ideas/browse_thread/thread/1eebf486969c39a1/?hl=en -- I can't figure out what is the point or conclusion of that discussion. Is there any technical reason? Or Ideological reason? -- regards, makoto kuwata -- http://mail.python.org/mailman/listinfo/python-list
Re: Method chaining on decorator got SyntaxError
On 17/02/2011 01:55, Makoto Kuwata wrote: Thank you MRAB, On Thu, Feb 17, 2011 at 8:49 AM, MRABpyt...@mrabarnett.plus.com wrote: You may want to read the discussion at: https://groups.google.com/group/python-ideas/browse_thread/thread/1eebf486969c39a1/?hl=en -- I can't figure out what is the point or conclusion of that discussion. Is there any technical reason? Or Ideological reason? Ideological. Keep it simple. Readability, not succinctness, is what's Pythonic. -- Mike Meyer -- http://mail.python.org/mailman/listinfo/python-list
Re: Method chaining on decorator got SyntaxError
On Thu, Feb 17, 2011 at 11:40 AM, MRAB pyt...@mrabarnett.plus.com wrote:
On 17/02/2011 01:55, Makoto Kuwata wrote:
Thank you MRAB,
On Thu, Feb 17, 2011 at 8:49 AM, MRABpyt...@mrabarnett.plus.com wrote:
You may want to read the discussion at:
https://groups.google.com/group/python-ideas/browse_thread/thread/1eebf486969c39a1/?hl=en
--
I can't figure out what is the point or conclusion of that discussion.
Is there any technical reason? Or Ideological reason?
Ideological.
Keep it simple.
Readability, not succinctness, is what's Pythonic. -- Mike Meyer
Thank you, MRAB.
I'm sad about this restriction because:
@recipe.product('*.html').ingreds('$(1).rst')
def file_html(c):
# do something
is enough simple and more readable than:
@recipe.product('*.html')
@recipe.ingreds('$(1).rst')
def file_html(c):
# do something
But I'll follow the Python's philosophy.
--
regards,
makoto kuwata
--
http://mail.python.org/mailman/listinfo/python-list
Re: Method chaining on decorator got SyntaxError
Makoto Kuwata k...@kuwata-lab.com wrote:
I'm sad about this restriction because:
@recipe.product('*.html').ingreds('$(1).rst')
def file_html(c):
# do something
is enough simple and more readable than:
@recipe.product('*.html')
@recipe.ingreds('$(1).rst')
def file_html(c):
# do something
But I'll follow the Python's philosophy.
Personally, I'd find this approach a lot clearer:
rst2html = recipe.product('*.html').ingred('$(1).rst')
@rst2html
def file_html(c):
# etc
It allows for easier reuse of your decorators and it labels it in a
way that I can understand from the name as opposed to having to
decipher the decorator method chain to work out its intent.
--
http://mail.python.org/mailman/listinfo/python-list
