python - Returning concatenated string as global variable -


so here code using : 

    global output_res     output_res = ""      def recurse(left, right, threshold, features, node, depth):         spacer = spacer_base * depth         if (threshold[node] != -2):             """print(spacer + "if ( " + features[node] + " <= " + \                 str(threshold[node]) + " ) {")"""             output_res += spacer + "if ( " + features[node] + " <= " + \                 str(threshold[node]) + " ) {"             if left[node] != -1:                 recurse (left, right, threshold, features, left[node], depth+1)             """print(spacer + "}\n" + spacer +"else {")"""             output_res += spacer + "}\n" + spacer +"else {"             if right[node] != -1:                 recurse (left, right, threshold, features, right[node], depth+1)             """print(spacer + "}")"""             output_res += spacer + "}"         else:             target = value[node]             i, v in zip(np.nonzero(target)[1], target[np.nonzero(target)]):                 target_name = target_names[i]                 target_count = int(v)                 """print(spacer + "return " + str(target_name) + " ( " + \                     str(target_count) + " examples )")"""                 output_res += spacer + "return " + str(target_name) + " ( " + \                     str(target_count) + " examples )"          return output_res      recurse(left, right, threshold, features, 0, 0)

as can see recurse() recursive function, aim to retrieve output_res, , use in main function, using code having error :

local variable 'output_res' referenced before assignment

update

i found exact solution looking :

            temp_list = []             def recurse(temp_list, left, right, threshold, features, node, depth):                 spacer = spacer_base * depth                 if (threshold[node] != -2):                     temp_list.append(spacer + "if ( " + features[node] + " <= " + \                         str(threshold[node]) + " ) {")                     if left[node] != -1:                             recurse (temp_list, left, right, threshold, features, left[node], depth+1)                     temp_list.append(spacer + "}\n" + spacer +"else {")                     if right[node] != -1:                             recurse (temp_list, left, right, threshold, features, right[node], depth+1)                     temp_list.append(spacer + "}")                 else:                     target = value[node]                     i, v in zip(np.nonzero(target)[1], target[np.nonzero(target)]):                         target_name = target_names[i]                         target_count = int(v)                         temp_list.append(spacer + "return " + str(target_name) + " ( " + \                             str(target_count) + " examples )")              recurse(temp_list, left, right, threshold, features, 0, 0)             return '\n'.join(temp_list)

if want go global variable

output_res = ""  def recurse(left, right, threshold, features, node, depth):     global output_res     //your code     //no need "return output_res"  recurse(left, right, threshold, features, 0, 0)

explanation:

in [8]: myg = 5  in [9]: def fun1():    ...:     myg=45    ...:   in [10]: def fun2():    ....:     print myg  in [11]: fun1()  in [12]: fun2() 5 //output  //now change fun1 global in [15]: def fun1():    ....:    global myg    ....:    myg=45  in [17]: fun1()  in [18]: fun2() 45 //output, explains how global affects scope

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