How do I create a class method that adds a key to a global dictionary in python-CodePudding

I am trying to build a database class in python, where i can add tables and rows and run other methods.

I'm facing an issue where when I add a table, it's not getting saved in the global dictionary. My code is as follows;

class DataBase():
    def __init__(self):
        self.data = {}
        
    def addTable(self, tableName):
        self.data[tableName] = {}

When I run that, then add a table and call on the dictionary, I still get an empty dict (as below)

tableName = "table"
DataBase().addTable(tableName)

DataBase().data

#output
{}

Can anyone help explain why this is?

CodePudding user response：

Try the following code:

tableName = "table"
x = DataBase()
x.addTable(tableName)

The problem with your code is that when you did DataBase().addTable(tablename) what python did is initialize a new object because of DataBase() and added a table to it instead of the one you wanted it to add to.

CodePudding user response：

you have to initialize the class

myDataBase = Database()