Hi, On Sat, Nov 14, 2015 at 8:23 PM, fl <rxjw...@gmail.com> wrote: > Hi, > > When I read the below code, I cannot make the last line (with ######) out. > > > > def res(weights): > n = len(weights) > indices = [] > C = [0.] + [sum(weights[:i+1]) for i in range(n)] > u0, j = random(), 0 ###### > > > If I run below code on console, it will say an error. > > uu, 0.1, 0 > > > What difference is between these two example lines?
I've noticed you sending a lot of questions in the past day or two, many at a fairly basic level. I think you would be well-served to read through the tutorial at https://docs.python.org/3/tutorial. It's been a while since I last read it, but I believe this question is covered there. To give to an answer anyway, the two lines ("u0, j = random(), 0" and "uu, 0.1, 0") are very different. The first is a tuple unpacking assignment. The right side (everything right of the equal sign) creates a tuple (comma creates a tuple, not parentheses) of the result of calling the 'random', and 0. The left side the equal sign is a list of names to which the right side values are assigned; the result of random() is assigned to the name 'u0', and 0 is assigned to 'j'. The same result could be achieved by the following two lines: u0 = random() j = 0 The second line attempts to make a tuple out of the value assigned to the name 'uu', the float 0.1, and the int 0, and throw it away. I'm assuming the error you got was a NameError because nothing was assigned to 'uu', but I could be wrong. For future questions, you should copy and paste the full traceback, which gives *a lot* more information than "there was an error". Hope this helps, -- Zach -- https://mail.python.org/mailman/listinfo/python-list
