def process_nested_parent_str(attr_str):
    '''
    The first letter should be a parenthesis
    input string: "(1,4,(5,6),7)"
    output: tuple (1,4,(4,6),7)
    '''
    params = []
    agg_scope_level = 0
    current_param = ''
    for i,ch in enumerate(attr_str):
        if ch==',':
            params.append(current_param)
            current_param = ''
        elif ch=='(':
            agg_scope_level +=1
        elif ch==')':
            agg_scope_level = 0
        elif agg_scope_level == 0:
            current_param += ch
    return params

def process_nested_parent_str2(attr_str,idx=0):
    '''
    The first letter should be a parenthesis
    input string: "(1,4,(5,6),7)"
    output: ['1','4',['5','6'],'7']
    '''
    #print 'Entering function with string %s'%(attr_str)
    params = []
    current_param = ''
    k = 0
    while (k<len(attr_str)):
        #print 'k in this function:%i'%k
        ch = attr_str[k]
        k += 1
        if ch==',':
            #print "Add param:",current_param
            params.append(current_param)
            current_param = ''
        elif ch=='(':
            nv = attr_str[k:]
            #print "Up one level parenthesis:%s"%(nv)
            current_param, progress = process_nested_parent_str2(nv)
            #print "Adding the list returned from nested",current_param
            params.append(current_param)
            current_param = ''
            k += progress+1
        elif ch==')':
            #print "Down one level parenthesis: %i caracters parsed"%k
            params.append(current_param)
            #print "Current params:",params#k -= acc-2
            return params,k
        else:
            current_param += ch
        #print "Ch:",ch
        #print "k:",k
        
        #raw_input("")
        #idx += 1
        
    params.append(current_param)
    return params,k
#print process_nested_parent_str2('1,2,3,4,5,6')
#idx=0
#print process_nested_parent_str2("'A','B','C'")
print process_nested_parent_str2("'A'")[0]
print process_nested_parent_str2("30.0,0.0,5.0")[0]
print process_nested_parent_str2("(Thomas)")[0]
print process_nested_parent_str2("Thomas, Paviot, ouais")[0]
print process_nested_parent_str2("1,2,(3,4,5),6,7,8")[0]
print process_nested_parent_str2("(#9149,#9166),#9142,.T.")[0]