python 33 pickle class instance in dict

Question

the following code

import pickle
class Member:
    global members
    try:
        with open('member dict.txt','rb') as f:
            members=pickle.load(f)
    except:
        members={}

    def __init__(self,name,info,new=True):
        if name in members and new:
            print('name is taken')
            self.name='Void'
            self.info={'Void':'Void'}
        else:
            self.info=info
            self.name=name
            members[name]=self
            if new:
                with open('member dict.txt','wb') as f:
                    pickle.dump(members,f)
    def __getstate__(self):
        return[self.name,self.info]
    def __setstate__(self,d):
        return Member(d[0],d[1],False)

then in idle (after prssing f5 in the first code) I type

PJ=member('P',{})

I close idle then reopen it and type

members

it returns {}

Answer 1

I ran your code myself, and the second time your program is run, the error is AttributeError: 'module' object has no attribute 'Member'. You're trying to unpickle your class before it's properly been constructed. To extend on the first comment, putting members into the class definition is what's making your code fail. Move it below the class definition, and it will work.

class Member:
    def __init__(self, name, info, new=True):
        ...
    ...

try:
    with open('member dict.txt', 'rb') as f:
        members = pickle.load(f)
except Exception as e:
    members = {}