import matplotlib.pyplot as plt%matplotlib inlineimport numpy as npN = 100x = np.arange(N)plt.scatter(x,  x+ np.random.randn(N), label = "tips")plt.legend()ax = plt.gca()# Locate the legend to the optimal position (automatic location does not work)legend = ax.get_legend()labels = (x.get_text() for x in legend.get_texts())ax.legend(legend.legendHandles, labels, loc='lower right')# Reset parametersplt.matplotlib.rcParams.update(plt.matplotlib.rcParamsDefault)# Plot againplt.plot([0,1], [0,1])

---------------------------------------------------------------------------ValueError                                Traceback (most recent call last)/usr/local/lib/python3.4/dist-packages/IPython/core/formatters.py in __call__(self, obj)    335                 pass    336             else:--> 337                 return printer(obj)    338             # Finally look for special method names    339             method = _safe_get_formatter_method(obj, self.print_method)/usr/local/lib/python3.4/dist-packages/IPython/core/pylabtools.py in <lambda>(fig)    205     206     if 'png' in formats:--> 207         png_formatter.for_type(Figure, lambda fig: print_figure(fig, 'png', **kwargs))    208     if 'retina' in formats or 'png2x' in formats:    209         png_formatter.for_type(Figure, lambda fig: retina_figure(fig, **kwargs))/usr/local/lib/python3.4/dist-packages/IPython/core/pylabtools.py in print_figure(fig, fmt, bbox_inches, **kwargs)    115     116     bytes_io = BytesIO()--> 117     fig.canvas.print_figure(bytes_io, **kw)    118     data = bytes_io.getvalue()    119     if fmt == 'svg':/usr/local/lib/python3.4/dist-packages/matplotlib/backend_bases.py in print_figure(self, filename, dpi, facecolor, edgecolor, orientation, format, **kwargs)   2149         origedgecolor = self.figure.get_edgecolor()   2150 -> 2151         self.figure.dpi = dpi   2152         self.figure.set_facecolor(facecolor)   2153         self.figure.set_edgecolor(edgecolor)/usr/local/lib/python3.4/dist-packages/matplotlib/figure.py in _set_dpi(self, dpi)    409     def _set_dpi(self, dpi):    410         self._dpi = dpi--> 411         self.dpi_scale_trans.clear().scale(dpi, dpi)    412         self.callbacks.process('dpi_changed', self)    413     dpi = property(_get_dpi, _set_dpi)/usr/local/lib/python3.4/dist-packages/matplotlib/transforms.py in scale(self, sx, sy)   1993         scale_mtx = np.array(   1994             [[sx, 0.0, 0.0], [0.0, sy, 0.0], [0.0, 0.0, 1.0]],-> 1995             np.float_)   1996         self._mtx = np.dot(scale_mtx, self._mtx)   1997         self.invalidate()ValueError: could not convert string to float: 'figure'<matplotlib.figure.Figure at 0x7fc0f80c3860>