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Date: Wed, 7 Aug 2013 16:50:48 +0800
Subject: make elements of a list twice or more.
From: liuerfire Wang <liuerfire@gmail.com>
To: python-list@python.org
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Sorry for the title which didn't make clear.

Here is a list x =3D [b, a, c] (a, b, c are elements of x. Each of them are
different type).  Now I wanna generate a new list as [b, b, a, a, c, c].

I know we can do like that:

tmp =3D []
for i in x:
    tmp.append(i)
    tmp.append(i)

However, I wander is there a more beautiful way to do it, like [i for i in
x]?

Thanks.


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<div dir=3D"ltr">Sorry for the title which didn&#39;t make clear.<div><br><=
/div><div>Here is a list x =3D [b, a, c] (a, b, c are elements of x. Each o=
f them are different type). &nbsp;Now I wanna generate a new list as [b, b,=
 a, a, c, c].</div>
<div><br></div><div>I know we can do like that:</div><blockquote style=3D"m=
argin:0 0 0 40px;border:none;padding:0px"><div>tmp =3D []</div><div>for i i=
n x:</div><div>&nbsp; &nbsp; tmp.append(i)</div><div>&nbsp; &nbsp; tmp.appe=
nd(i)</div><div><br>
</div></blockquote><div>However, I wander is there a more beautiful way to =
do it, like [i for i in x]?</div><div><br></div><div>Thanks.</div><div><br>=
</div><div><div><br></div>-- <br><div>Best regards.</div><div>/************=
**********************</div>
<div><div>google+:&nbsp;<a href=3D"http://gplus.to/onepiece" target=3D"_bla=
nk">+liuerfire</a>&nbsp;twitter:&nbsp;<a href=3D"https://twitter.com/#!/liu=
erfire" target=3D"_blank">@liuerfire</a></div><div><a href=3D"http://db.tt/=
YGEdRM0" target=3D"_blank">=B5=B0=CC=DB=B2=BB=B5=B0=CC=DB=B5=C4=B6=BC=BF=C9=
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