pairwise combination of two lists

Yingjie Lin Yingjie.Lin at
Wed Aug 17 22:22:48 CEST 2011

Hi Python users,

I have two lists: 

li1 = ['a', 'b']
li2 = ['1', '2']

and I wish to obtain a list like this

li3 = ['a1', 'a2', 'b1', 'b2']

Is there a handy and efficient function to do this, especially when li1 and li2 are long lists.
I found zip() but it only gives [('a', '1'), ('b', '2')],  not exactly what I am looking for.

Thank you.

- Yingjie

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