On 06/15/2011 12:53 PM, jonasr wrote: > > Thank you for the fast reply, according to you line and "line," shouldt make > a difference in this case,
No, that's not what I said. Using "line" gives you a list with one element, but using "line," gives you the element itself, not the list. > i tried the code with line and line, and it only works with line, ? > > so you say if i use > a=[1,2,3] > then b, = a should be 1 ? i just get the error message to many values to > unpack ... Yes, when you use this automatic unpacking the number of items has to match. You can only use a, b = rhs when you *know* rhs will be a sequence with two, and only two, elements. Eric > > > > efiring wrote: >> >> On 06/15/2011 12:35 PM, jonasr wrote: >>> >>> hello, >>> >>> a lot of matplotlib examples i saw included the usage of line, i.e. >>> >>> from pylab import * >>> import time >>> >>> ion() >>> >>> tstart = time.time() # for profiling >>> x = arange(0,2*pi,0.01) # x-array >>> line, = plot(x,sin(x)) >>> for i in arange(1,200): >>> line.set_ydata(sin(x+i/10.0)) # update the data >>> draw() # redraw the canvas >>> >>> print 'FPS:' , 200/(time.time()-tstart) >>> >>> can anybody explain to me whats the difference between line and line, ? >>> >> >> plot returns a list of lines, and >> >> line, = plot(...) >> >> returns the first one (which in your case is the only one) >> >> It is the same as >> >> line = plot(...)[0] >> >> It is a special case of Python's sequence unpacking, e.g.: >> >> a, b, c = [1, 2, 3] >> >> Eric >> >> ------------------------------------------------------------------------------ >> EditLive Enterprise is the world's most technically advanced content >> authoring tool. Experience the power of Track Changes, Inline Image >> Editing and ensure content is compliant with Accessibility Checking. >> http://p.sf.net/sfu/ephox-dev2dev >> _______________________________________________ >> Matplotlib-users mailing list >> Matplotlib-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/matplotlib-users >> >> > ------------------------------------------------------------------------------ EditLive Enterprise is the world's most technically advanced content authoring tool. Experience the power of Track Changes, Inline Image Editing and ensure content is compliant with Accessibility Checking. http://p.sf.net/sfu/ephox-dev2dev _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
