Below is Python class where I’m storing/resetting some data:

import uuid
import time

class MyApp:

    data = {}

    def set_data(self):
        print('data length', len(self.data))
        hash = uuid.uuid4().hex
        self.data[hash] = {'dummy': 'dummy'}

    def reset_data(self):
        self.data = {}
        print('data length after reset', len(self.data))

while True:
    app = MyApp()
    app.set_data()
    app.reset_data()
    time.sleep(1)

And here a sample of the output:

data length 0
data length after reset 0
data length 1
data length after reset 0
data length 2
data length after reset 0
data length 3
data length after reset 0
data length 4
data length after reset 0

As you can see data keeps growing, even though I am resetting it inside while loop.

Can you explain to me why it keeps growing?