PyOpenGl 尝试迭代 NoneType 时导入失败

Question

试图让一个名为 chemlab 的库在 python 3.5 中工作

它需要 PyQT4，它需要 PyOpenGL

所有这些都在 64 位机器上，但一切——从 python 到每个库都是 32 位的（也许这很重要）

初始代码是

from chemlab.graphics.qt import QtViewer
from chemlab.graphics.renderers import PointRenderer
from chemlab.graphics.uis import TextUI

vertices = [[0.0, 0.0, 0.0], [0.0, 1.0, 0.0], [2.0, 0.0, 0.0]]
blue = (0, 255, 255, 255)

colors = [blue, ] * 3

v = QtViewer()

pr = v.add_renderer(PointRenderer, vertices, colors)
tu = v.add_ui(TextUI, 100, 100, 'Hello, world!')

v.run()

调用栈如下

Traceback (most recent call last):
  File "C:/Users/eldar/PycharmProjects/ChemTo3D/Proccessor.py", line 13, in <module> tu = v.add_ui(TextUI, 100, 100, 'Hello, world!')
  File "C:\Users\eldar\AppData\Local\Programs\Python\Python35-32\lib\site-packages\chemlab\graphics\qt\qtviewer.py", line 189, in add_ui
    ui = klass(self.widget, *args, **kwargs)
  File "C:\Users\eldar\AppData\Local\Programs\Python\Python35-32\lib\sitepackages\chemlab\graphics\uis.py", line 120, in __init__
    props = setup_textures()
  File "C:\Users\eldar\AppData\Local\Programs\Python\Python35-32\lib\site-packages\chemlab\graphics\uis.py", line 17, in setup_textures
    ft = ImageFont.truetype(font_name, height)
  File "C:\Users\eldar\AppData\Local\Programs\Python\Python35-32\lib\site-packages\PIL\ImageFont.py", line 238, in truetype
    return FreeTypeFont(font, size, index, encoding)
  File "C:\Users\eldar\AppData\Local\Programs\Python\Python35-32\lib\site-packages\PIL\ImageFont.py", line 127, in __init__
    self.font = core.getfont(font, size, index, encoding)
OSError: cannot open resource
Exception ignored in: <bound method VertexBuffer.__del__ of <chemlab.graphics.buffers.VertexBuffer object at 0x04FF7630>>
Traceback (most recent call last):
  File "C:\Users\eldar\AppData\Local\Programs\Python\Python35-32\lib\site-packages\chemlab\graphics\buffers.py", line 26, in __del__
  File "C:\Users\eldar\AppData\Local\Programs\Python\Python35-32\lib\site-packages\OpenGL\wrapper.py", line 98, in __nonzero__
  File "C:\Users\eldar\AppData\Local\Programs\Python\Python35-32\lib\site-packages\OpenGL\platform\baseplatform.py", line 376, in __nonzero__
  File "C:\Users\eldar\AppData\Local\Programs\Python\Python35-32\lib\site-packages\OpenGL\platform\baseplatform.py", line 381, in load
  File "<frozen importlib._bootstrap>", line 969, in _find_and_load
  File "<frozen importlib._bootstrap>", line 954, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 887, in _find_spec
TypeError: 'NoneType' object is not iterable
Exception ignored in: <bound method VertexBuffer.__del__ of <chemlab.graphics.buffers.VertexBuffer object at 0x04FF7D10>>
Traceback (most recent call last):
  File "C:\Users\eldar\AppData\Local\Programs\Python\Python35-32\lib\site-packages\chemlab\graphics\buffers.py", line 26, in __del__
  File "C:\Users\eldar\AppData\Local\Programs\Python\Python35-32\lib\site-packages\OpenGL\wrapper.py", line 98, in __nonzero__
  File "C:\Users\eldar\AppData\Local\Programs\Python\Python35-32\lib\site-packages\OpenGL\platform\baseplatform.py", line 376, in __nonzero__
  File "C:\Users\eldar\AppData\Local\Programs\Python\Python35-32\lib\site-packages\OpenGL\platform\baseplatform.py", line 381, in load
  File "<frozen importlib._bootstrap>", line 969, in _find_and_load
  File "<frozen importlib._bootstrap>", line 954, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 887, in _find_spec
TypeError: 'NoneType' object is not iterable

编辑：阻止任何内容显示的部分是文本。枕头一点也不好玩。如果没有尝试显示文本，分子确实会显示，所以我不再确定 opengl 导入错误在做什么 - 也许什么都没有，也许着色器不可用。正在调查中。

Answer 1

这通常是因为您缺少字体。

查看 github 上的代码，它正在寻找“Arial.ttf”： https://github.com/chemlab/chemlab/blob/cded640add8322bf315abdb155e2e21d942ae337/chemlab/graphics/uis.py#L14