[issue7660] Two float('nan') are not equal

New submission from Jean-Michel Fauth wxjmfa...@gmail.com: I did not find any report about this. Windows 7, Python 2.6.4 float('inf') == float('inf') True float('-inf') == float('-inf') True float('-inf') == float('inf') False float('-inf') != float('inf') True float('nan') ==

[issue7660] Two float('nan') are not equal

Mark Dickinson dicki...@gmail.com added the comment: float('nan') == float('nan') False float('nan') != float('nan') True This is deliberate, though perhaps surprising if you haven't seen it before. There's a long history of nan comparisons behaving this way (that is, x == nan always