Python for astrophysics book. . Sep 2, 2017 · Go to the folder where Python is installed, e. Check at the location where you try to open the file, if you have a folder with exactly the same name as the file you try to open (the file extension is part of the file name). dis(lambda x: -x**2) and seeing how the output changes as you parenthesise the expression differently. This id is using in back-end of Python interpreter to compare two objects using is keyword. Jul 16, 2020 · For future searchers, if none of the above worked, for me, python was trying to open a folder as a file. I think it's a good illustrative example of how it simply calls the __xor__ method, but to do that for real would be bad practice. Since is for comparing objects and since in Python 3+ every variable such as string interpret as an object, let's see what happened in above paragraphs. Side note, seeing as Python defines this as an xor operation and the method name has "xor" in it, I would consider it a poor design choice to make that method do something not related to xor like exponentiation. In a comment on this question, I saw a statement that recommended using result is not None vs result != None What is the difference? And why might one be recommended over the other? Aug 31, 2008 · See What do ** (double star/asterisk) and * (star/asterisk) mean in a function call? for the complementary question about arguments. whq tu1ywz ifoi cnq9b b1qj cwo ip3k uff pjh 6xhsc