New issue 1171: Yt assumes matplotlib._png takes 5 arguments, but it takes only 3 https://bitbucket.org/yt_analysis/yt/issues/1171/yt-assumes-matplotlib_png-t... Anonymous: Matplotlib version: '1.5.1' (most updated on conda) Yt version: '3.2.1' (most updated on conda) matplotlib._png() does not take 5 arguments anymore, as is assumed in png_writer.py. This gives the following error when calling functions, such as cam.snapshot('myim.png'): ... return write_bitmap(out.swapaxes(0, 1), filename) File "C:\Anaconda\lib\site-packages\yt\visualization\image_writer.py", line 175, in write_bitmap pw.write_png(bitmap_array, filename) File "C:\Anaconda\lib\site-packages\yt\utilities\png_writer.py", line 19, in write_png _png.write_png(buffer, width, height, filename, dpi) TypeError: write_png() takes at most 3 arguments (5 given) Solution: OLD FUNCTION: def write_png(buffer, filename, dpi=100): width = buffer.shape[1] height = buffer.shape[0] _png.write_png(buffer, filename, dpi) NEW FUNCTION (FOR RECENT MATPLOTLIB): def write_png(buffer, filename, dpi=100): _png.write_png(buffer, filename, dpi)