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treestr =  "[[A:10, B:8, C:7]D:11, E:12, F:13]"
MyTree = {}
def createTree(substring,node):
    l = len(substring)
    if l == 0:
        return
    if substring[0] == '[':
        c = 1
        i = 1
        while c != 0 and i < l:
            if substring[i] == '[':
                c += 1
            elif substring[i] == ']':
                c -= 1
            else :
                pass
            i += 1
        j = i
        while  j < l:
            if substring[j] == ',':
                break
       


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