How to parse a string in python? -

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I am trying to parse a string. As if this is the string "(A (B (CD) (EF)) (GH)) ", then I want to parse it like the children of A are B and G, near B Children are C and E, and no one has any child, so I want to get the output to be ['A_B_G', 'B_C_E']

I do something like that I am: 

  lst = [] Str = (A (B) (EF)) (GH)) lst.append (str.split (''))

And then I'm stuck!

Can someone give me an idea of ​​what to do next?

I'm not too much a signal, but you can list the same 

 You can start by changing the  ['(', 'A', '(', 'B', ...]

, Such as (, ) or a letter.


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