Why line != "\n" or line != "\r\n" or line !="\r" can't filte blank line?

Blank line contain only \n or \r\n or \r.

tempfile = open(file,"r")
for id,line in  enumerate(tempfile):
    if(line != "\n" or line != "\r\n" or line !="\r"):
        print(id,line)

Why blank line can be still printed?