TypeError: replace() takes at least 3 arguments (2 given) part 2

[swimmer2020]

No description provided.

[swimmer2020]

this is my code:
##replacing the old high score with their new high score##
filedata = database.read()
database.close()
newdata=filedata.replace(userStuff[0]+" "+userStuff[1]+" "+userStuff[2]+userStuff[0]+" "+userStuff[1]+" "+str(player1score))
database=open("usernames","w")
database.write(newdata)

It comes up with the error:
TypeError: replace() takes at least 3 arguments (2 given)

Why?