# variable_tracker.py

# variable_tracker.py

xxx = 'xxx'
yyy = 'yyy'
ddd = {xxx: 5, yyy: 0}

def test():
    print(tr(xxx))
    print(tr(yyy))
    print(tr(yyy))
    print(tr(yyy))
    print(tr(yyy,0))
    print(tr(yyy))
    print(tr(yyy))
    print(tr(xxx))
    print(tr('zzz',99))
    print(tr(zzz))

def tr(var, i='void'):
    if var in ddd:
        if i != 'void':
            ddd[var] = i
        else:
            ddd[var] += 1
        return ddd[var]
    else:
        exec('global '+var+'; '+var+' = "'+var+'"') # caution: exec() can corrupt if used unwisely !!!
        ddd[var] = i
        return i

test()