Multiline plpython procedure

Hi,

I am biwildered at how to create a multi-line plpython function in
Postgres. When I create the function in one line like this:

CREATE or REPLACE FUNCTION circ (float)
RETURNS float AS 'from math import pi; return 2*pi*args[0]' LANGUAGE
plpythonu;

and then use SELECT circ(1) to test it, it runs well.

But if I try to make the code looks better by separating it into
mulitple lines, like this:

CREATE or REPLACE FUNCTION circ (float)
RETURNS float AS '
from math import pi
return 2*pi*args[0]' LANGUAGE plpythonu;

I got an error message:

ERROR: plpython: could not compile function "circ"
DETAIL: exceptions.SyntaxError: invalid syntax (line 2)

How to get Postgres to accept a normal looking python function?

Greetings

--
HONG Yuan
Homemaster Trading Co., Ltd.
No. 601, Bldg. 41, 288 Shuangyang Rd. (N)
Shanghai 200433, P.R.C.
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E-mail: hongyuan(at)homemaster(dot)cn