In python How to ensure that seed in using randint keeps changing when i am trying to pick a random number?

def claims(dataframe):
    dataframe.loc[(dataframe.severity ==1),'claims_made']= randint(200, 20000)
    return dataframe 

here 'severity' is an existing column and 'claims_made' is a new column, I want to have the randint keep picking different values that are being assigned to the 'claims_made' column. because for now it's just picking one random value out of the bucket specified and is assigning the same value to all the rows that satisfy the condition