Python global variable and class functionality -

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im creating simple python program gives basic functionality of sms_inbox. have created sms_inbox method.

store = [] message_count = 0 class sms_store:     def add_new_arrival(self,number,time,text):         store.append(("from: "+number, "recieved: "+time,"msg: "+text))         **message_count += 1**     def delete(self,i):         if > len(store-1):             print("index not exist")         else:             del store[i]             message_count -= 1

in bolded bit getting error:

unboundlocalerror: local variable 'message_count' referenced before assignment.

i created global variable store empty list , works when use add_new_variable object. reason not adding values global message_count variable.

please help

that's not how classes work. data should stored within class instance, not globally.

class smsstore(object):     def __init__(self):         self.store = []         self.message_count = 0      def add_new_arrival(self,number,time,text):         self.store.append(("from: "+number, "recieved: "+time,"msg: "+text))         self.message_count += 1      def delete(self, i):         if >= len(store):             raise indexerror         else:             del self.store[i]             self.message_count -= 1  sms_store = smsstore() sms_store.add_new_arrival("1234", "now", "lorem ipsum") try:     sms_store.delete(20) except indexerror:     print("index not exist")  print sms_store.store  # multiple separate stores sms_store2 = smsstore() sms_store2.add_new_arrival("4321", "then", "lorem ipsum") print sms_store2.store

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