python - 文件 "E:\python\lib\re.py"，第 229 行，在 finditer 中返回 _compile(pattern, flags).finditer(string) TypeError : expected string or bytes-like object

Question

我正在使用 skimage.feature.greycomatrix 来计算图像的 GLCM(灰度共现矩阵)，但是当我使用时:

from skimage.feature import greycomatrix 

在 python 3.6.4 shell 中 - 它可以工作。 See image

但是当我在我的 sublime Text 3 中使用它时，那么会报错:

Traceback (most recent call last):
  File "C:\Users\Martin Ma\Desktop\every day python\test\GLCM\main.py", line 80, in <module>
    from skimage.feature import greycomatrix
  File "E:\python\lib\site-packages\skimage\feature\__init__.py", line 9, in <module>
    from .peak import peak_local_max
  File "E:\python\lib\site-packages\skimage\feature\peak.py", line 3, in <module>
    from ..segmentation import relabel_sequential
  File "E:\python\lib\site-packages\skimage\segmentation\__init__.py", line 1, in <module>
    from .random_walker_segmentation import random_walker
  File "E:\python\lib\site-packages\skimage\segmentation\random_walker_segmentation.py", line 43, in <module>
    from ..filters import rank_order
  File "E:\python\lib\site-packages\skimage\filters\__init__.py", line 3, in <module>
    from .edges import (sobel, sobel_h, sobel_v,
  File "E:\python\lib\site-packages\skimage\filters\edges.py", line 17, in <module>
    from ..restoration.uft import laplacian
  File "E:\python\lib\site-packages\skimage\restoration\__init__.py", line 12, in <module>
    from .inpaint import inpaint_biharmonic
  File "E:\python\lib\site-packages\skimage\restoration\inpaint.py", line 9, in <module>
    from ..measure import label
  File "E:\python\lib\site-packages\skimage\measure\__init__.py", line 6, in <module>
    from ._regionprops import regionprops, perimeter
  File "E:\python\lib\site-packages\skimage\measure\_regionprops.py", line 645, in <module>
    _install_properties_docs()
  File "E:\python\lib\site-packages\skimage\measure\_regionprops.py", line 632, in _install_properties_docs
    prop_doc = _parse_docs()
  File "E:\python\lib\site-packages\skimage\measure\_regionprops.py", line 625, in _parse_docs
    doc, flags=re.DOTALL)
  File "E:\python\lib\re.py", line 229, in finditer
    return _compile(pattern, flags).finditer(string)
TypeError: expected string or bytes-like object

(See picture of Sublime Text error)

谁能告诉我为什么会这样，我该如何解决？

我的代码:

from skimage.feature import greycomatrix
import numpy as np 

image=np.array([[1,1,5,6,8],
                [0,0,5,7,1],
                [4,0,0,1,2],
                [8,5,1,2,5]],dtype=np.uint8)
#levels=256   image   this test is 9
result=greycomatrix(image,[1],[0,np.pi/4,np.pi/2,3*np.pi/4],levels=9)
print(result[:, :, 0, 0])

enter image description here

Answer 1

您正在使用 -OO 运行 Python标志，丢弃文档字符串，用 None 替换它们。 skimage.measure._regionprops includes code在初始化期间，解析一个函数的文档字符串以设置一堆其他函数的文档字符串。当文档字符串被丢弃时，这会失败。在没有 -OO 标志的情况下运行 Python 可以避免这个问题。

看起来在 scikit-image 代码库的其他部分可能遇到并修复了类似的问题；我看到一些地方已经检查是否将文档字符串设置为 None，例如 skimage.io .要使 skimage.measure._regionprops 与 -OO 兼容，必须向该模块添加对 None 文档字符串的类似检查。不过，_install_properties_docs 做的不仅仅是文档字符串处理，所以如果我们没有文档字符串，我们不能跳过整个过程。