Traceback (most recent call last):
  File "stats-registry-v2.py", line 507, in <module>
    GOTRUYEARS("IPv6")
  File "stats-registry-v2.py", line 441, in GOTRUYEARS
    CALCULATEIPv6("01-06",YEAR)
  File "stats-registry-v2.py", line 332, in CALCULATEIPv6
    PERIOD=CALCULATEPERIOD(RANGE) #Lets determine in which quater of the year to work
  File "stats-registry-v2.py", line 234, in CALCULATEPERIOD
    return PERIOD 
UnboundLocalError: local variable 'PERIOD' referenced before assignment