On 12/31/2010 7:22 AM gervaz said...
Hi all, I would like to ask you how I can use the more efficient join
operation in a code like this:
class Test:
... def __init__(self, v1, v2):
... self.v1 = v1
... self.v2 = v2
...
def prg(l):
... txt = ""
... for x in l:
... if x.v1 is not None:
... txt += x.v1 + "\n"
... if x.v2 is not None:
... txt += x.v2 + "\n"
... return txt
...
t1 = Test("hello", None)
t2 = Test(None, "ciao")
t3 = Test("salut", "hallo")
t = [t1, t2, t3]
prg(t)
'hello\nciao\nsalut\nhallo\n'
The idea would be create a new list with the values not None and then
use the join function... but I don't know if it is really worth it.
Any hint?
def prg2(l):
return "\n".join([x for x in l if x])
Emile
... e = []
... for x in l:
... if x.v1 is not None:
... e.append(x.v1)
... if x.v2 is not None:
... e.append(x.v2)
... return "\n".join(e)
...
prg2(t)
'hello\nciao\nsalut\nhallo'
Thanks, Mattia
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