I am allocating a case number to the user and I want to print the case number that I have allocated

The problem is that I have allocated a case number to the user and I want it to print the number given to the user,however it displays 'None'.

Welcome
Your case number is:
8239
Sending data: None

This is the code:

while True:
    print('Welcome')
    print('Your case number is:')
    import random
    variable1 = lambda: random.randint(1, 10000)
    print(variable1())
    state=random.getstate()
    print('Sending data:',(random.setstate(state)))
    break