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从'matplotlib.patches.regularPolygon'继承在实例化时生成'valueerror'

matplotlib python

Paul Brodersen · 技术社区 · 6 年前

matplotlib.patches.RegularPolygon . matplotlib.patches.Circle 和 Circle RegularPolygon .

link )很长一段时间没有看到它(可能是因为我找错了地方)。

import matplotlib

class RegularPolygon(matplotlib.patches.RegularPolygon):
    def __init__(self, *args, **kwargs):
        super(matplotlib.patches.RegularPolygon, self).__init__(*args, **kwargs)

RegularPolygon((0.,0.), 5, radius=5, orientation=0)

错误消息

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-4-1189a0acbaf3> in <module>()
----> 1 RegularPolygon((0.,0.), 5, radius=5, orientation=0)

<ipython-input-3-3cc2c77e24bf> in __init__(self, *args, **kwargs)
      6
      7     def __init__(self, *args, **kwargs):
----> 8         super(matplotlib.patches.RegularPolygon, self).__init__(*args, **kwargs)

/home/paul/.virtualenvs/base2/local/lib/python2.7/site-packages/matplotlib/patches.pyc in __init__(self, edgecolor, facecolor, color, linewidth, linestyle, antialiased, hatch, fill, capstyle, joinstyle, **kwargs)
     93             self.set_color(color)
     94         else:
---> 95             self.set_edgecolor(edgecolor)
     96             self.set_facecolor(facecolor)
     97         # unscaled dashes.  Needed to scale dash patterns by lw

/home/paul/.virtualenvs/base2/local/lib/python2.7/site-packages/matplotlib/patches.pyc in set_edgecolor(self, color)
    282         """
    283         self._original_edgecolor = color
--> 284         self._set_edgecolor(color)
    285
    286     def set_ec(self, color):

/home/paul/.virtualenvs/base2/local/lib/python2.7/site-packages/matplotlib/patches.pyc in _set_edgecolor(self, color)
    270                 set_hatch_color = False
    271
--> 272         self._edgecolor = colors.to_rgba(color, self._alpha)
    273         if set_hatch_color:
    274             self._hatch_color = self._edgecolor

/home/paul/.virtualenvs/base2/local/lib/python2.7/site-packages/matplotlib/colors.pyc in to_rgba(c, alpha)
    132         rgba = _colors_full_map.cache[c, alpha]
    133     except (KeyError, TypeError):  # Not in cache, or unhashable.
--> 134         rgba = _to_rgba_no_colorcycle(c, alpha)
    135         try:
    136             _colors_full_map.cache[c, alpha] = rgba

/home/paul/.virtualenvs/base2/local/lib/python2.7/site-packages/matplotlib/colors.pyc in _to_rgba_no_colorcycle(c, alpha)
    187     c = tuple(c.astype(float))
    188     if len(c) not in [3, 4]:
--> 189         raise ValueError("RGBA sequence should have length 3 or 4")
    190     if len(c) == 3 and alpha is None:
    191         alpha = 1

ValueError: RGBA sequence should have length 3 or 4

1 回复 | 直到 6 年前

ImportanceOfBeingErnest 6 年前

使用

super(matplotlib.patches.RegularPolygon, self).__init__()

matplotlib.patches.RegularPolygon matplotlib.patches.RegularPolygon

我也建议不要为子类艺术家使用相同的名称,因为这可能会增加这里的混乱。

旧款

import matplotlib

class MyRegularPolygon(matplotlib.patches.RegularPolygon):
    def __init__(self, *args, **kwargs):
        matplotlib.patches.RegularPolygon.__init__(self, *args, **kwargs)

r = MyRegularPolygon((0.,0.), 5, radius=5, orientation=0)

import matplotlib

class MyRegularPolygon(matplotlib.patches.RegularPolygon):
    def __init__(self, *args, **kwargs):
        super(MyRegularPolygon, self).__init__(*args, **kwargs)

r = MyRegularPolygon((0.,0.), 5, radius=5, orientation=0)

import matplotlib

class MyRegularPolygon(matplotlib.patches.RegularPolygon):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

r = MyRegularPolygon((0.,0.), 5, radius=5, orientation=0)

我建议你阅读 What does 'super' do in Python? super