I like this argument: :)

"Many Python style guides recommend the use of a single underscore “_” for throwaway variables rather than the double underscore “__” recommended here. The issue is that “_” is commonly used as an alias for the gettext() function, and is also used at the interactive prompt to hold the value of the last operation. Using a double underscore instead is just as clear and almost as convenient, and eliminates the risk of accidentally interfering with either of these other use cases."

http://docs.python-guide.org/en/latest/writing/style/#unpacking