=================================== FAILURES ===================================____________________________ test_matplotlib_intro _____________________________c = array([[ 0.12156863,  0.46666667,  0.70588235,  1.        ]]), alpha = None    def to_rgba(c, alpha=None):        """Convert `c` to an RGBA color.            If `alpha` is not `None`, it forces the alpha value, except if `c` is        "none" (case-insensitive), which always maps to `(0, 0, 0, 0)`.        """        # Special-case nth color syntax because it should not be cached.        if _is_nth_color(c):            from matplotlib import rcParams            prop_cycler = rcParams['axes.prop_cycle']            colors = prop_cycler.by_key().get('color', ['k'])            c = colors[int(c[1]) % len(colors)]        try:>           rgba = _colors_full_map.cache[c, alpha]E           TypeError: unhashable type: 'numpy.ndarray'../../venv/dev/lib/python3.5/site-packages/matplotlib/colors.py:132: TypeErrorDuring handling of the above exception, another exception occurred:    @pytest.mark.skipif(matplotlib is None, reason="no matplotlib")    def test_matplotlib_intro():        """Examples from the 'introduction' notebook."""        try:            name = 'test'            tmp_file = TmpFileManager.tmp_file                p = plot(x)            p = plot(x*sin(x), x*cos(x))            p.extend(p)            p[0].line_color = lambda a: a            p[1].line_color = 'b'            p.title = 'Big title'            p.xlabel = 'the x axis'            p[1].label = 'straight line'            p.legend = True            p.aspect_ratio = (1, 1)            p.xlim = (-15, 20)>           p.save(tmp_file('%s_basic_options_and_colors' % name))diofant/plotting/tests/test_plot.py:80: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ diofant/plotting/plot.py:181: in save    self._backend.save(path)diofant/plotting/plot.py:966: in save    self.process_series()diofant/plotting/plot.py:945: in process_series    if self.ax.legend():../../venv/dev/lib/python3.5/site-packages/matplotlib/axes/_axes.py:497: in legend    **kwargs)../../venv/dev/lib/python3.5/site-packages/matplotlib/legend.py:1403: in _parse_legend_args    handles, labels = _get_legend_handles_labels(axs, handlers)../../venv/dev/lib/python3.5/site-packages/matplotlib/legend.py:1361: in _get_legend_handles_labels    and not _in_handles(handle, label)):../../venv/dev/lib/python3.5/site-packages/matplotlib/legend.py:1340: in _in_handles    if (colors.to_rgba(f_h.get_color()) != colors.to_rgba(h.get_color())):../../venv/dev/lib/python3.5/site-packages/matplotlib/colors.py:134: in to_rgba    rgba = _to_rgba_no_colorcycle(c, alpha)_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ c = array([[ 0.12156863,  0.46666667,  0.70588235,  1.        ]]), alpha = None    def _to_rgba_no_colorcycle(c, alpha=None):        """Convert `c` to an RGBA color, with no support for color-cycle syntax.            If `alpha` is not `None`, it forces the alpha value, except if `c` is        "none" (case-insensitive), which always maps to `(0, 0, 0, 0)`.        """        orig_c = c        if isinstance(c, six.string_types):            if c.lower() == "none":                return (0., 0., 0., 0.)            # Named color.            try:                # This may turn c into a non-string, so we check again below.                c = _colors_full_map[c.lower()]            except KeyError:                pass        if isinstance(c, six.string_types):            # hex color with no alpha.            match = re.match(r"\A#[a-fA-F0-9]{6}\Z", c)            if match:                return (tuple(int(n, 16) / 255                              for n in [c[1:3], c[3:5], c[5:7]])                        + (alpha if alpha is not None else 1.,))            # hex color with alpha.            match = re.match(r"\A#[a-fA-F0-9]{8}\Z", c)            if match:                color = [int(n, 16) / 255                         for n in [c[1:3], c[3:5], c[5:7], c[7:9]]]                if alpha is not None:                    color[-1] = alpha                return tuple(color)            # string gray.            try:                return (float(c),) * 3 + (alpha if alpha is not None else 1.,)            except ValueError:                pass            raise ValueError("Invalid RGBA argument: {!r}".format(orig_c))        # tuple color.        c = np.array(c)        if not np.can_cast(c.dtype, float, "same_kind") or c.ndim != 1:            # Test the dtype explicitly as `map(float, ...)`, `np.array(...,            # float)` and `np.array(...).astype(float)` all convert "0.5" to 0.5.            # Test dimensionality to reject single floats.>           raise ValueError("Invalid RGBA argument: {!r}".format(orig_c))E           ValueError: Invalid RGBA argument: array([[ 0.12156863,  0.46666667,  0.70588235,  1.        ]])../../venv/dev/lib/python3.5/site-packages/matplotlib/colors.py:185: ValueError=============== 1 failed, 4 passed, 2 xfailed in 133.04 seconds ================