Import 属性错误：模块'；pytest'；没有属性'；马克'；至于；从sklearn.model“选择导入交叉值”；

当我尝试导入“sklearn”并使用它时，我得到了“属性错误”

Jupyter笔记本的错误如下：

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-33-9fc361c79a41> in <module>()
      2 # Multiple Linear REgression (Least Square fitting)
      3 
----> 4 from sklearn.model_selection import cross_val_score
      5 from sklearn.linear_model import LinearRegression
      6 #from sklearn.model_selection.train_test_split import train_test_split

D:\Anaconda_details\lib\site-packages\sklearn\model_selection\__init__.py in <module>()
     17 from ._split import check_cv
     18 
---> 19 from ._validation import cross_val_score
     20 from ._validation import cross_val_predict
     21 from ._validation import cross_validate

D:\Anaconda_details\lib\site-packages\sklearn\model_selection\_validation.py in <module>()
     29 from ..utils._joblib import logger
     30 from ..externals.six.moves import zip
---> 31 from ..metrics.scorer import check_scoring, _check_multimetric_scoring
     32 from ..exceptions import FitFailedWarning
     33 from ._split import check_cv

D:\Anaconda_details\lib\site-packages\sklearn\metrics\__init__.py in <module>()
      5 
      6 
----> 7 from .ranking import auc
      8 from .ranking import average_precision_score
      9 from .ranking import coverage_error

D:\Anaconda_details\lib\site-packages\sklearn\metrics\ranking.py in <module>()
     34 from ..utils.sparsefuncs import count_nonzero
     35 from ..exceptions import UndefinedMetricWarning
---> 36 from ..preprocessing import label_binarize
     37 
     38 from .base import _average_binary_score

D:\Anaconda_details\lib\site-packages\sklearn\preprocessing\__init__.py in <module>()
      4 """
      5 
----> 6 from ._function_transformer import FunctionTransformer
      7 
      8 from .data import Binarizer

D:\Anaconda_details\lib\site-packages\sklearn\preprocessing\_function_transformer.py in <module>()
      3 from ..base import BaseEstimator, TransformerMixin
      4 from ..utils import check_array
----> 5 from ..utils.testing import assert_allclose_dense_sparse
      6 from ..externals.six import string_types
      7 

D:\Anaconda_details\lib\site-packages\sklearn\utils\testing.py in <module>()
    758     import pytest
    759 
--> 760     skip_if_32bit = pytest.mark.skipif(_IS_32BIT,
    761                                        reason='skipped on 32bit platforms')
    762     skip_travis = pytest.mark.skipif(os.environ.get('TRAVIS') == 'true',

AttributeError: module 'pytest' has no attribute 'mark'

我尝试pip安装时再次出错

(base) C:\Users\shashi>pip install scikit-learn
Collecting scikit-learn
  Downloading https://files.pythonhosted.org/packages/d3/fa/b50821115c16e9b8ca307d3788e3dd1ec71cade3e564953ed7330a1fa3e0/scikit_learn-0.20.3-cp35-cp35m-win_amd64.whl (4.8MB)
    100% |################################| 4.8MB 546kB/s

Requirement already satisfied: scipy>=0.13.3 in d:\anaconda_details\lib\site-packages (from scikit-learn) (1.1.0)
Requirement already satisfied: numpy>=1.8.2 in d:\anaconda_details\lib\site-packages (from scikit-learn) (1.15.2)
twisted 18.7.0 requires PyHamcrest>=1.9.0, which is not installed.

Installing collected packages: scikit-learn

Could not install packages due to an EnvironmentError: [WinError 5] Access is denied: 'D:\\Anaconda_details\\Lib\\site-packages\\sklearn\\feature_extraction\\_hashing.cp35-win_amd64.pyd'
Consider using the `--user` option or check the permissions.

You are using pip version 18.0, however version 19.0.3 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

我已尝试使用conda卸载和安装。但这也帮不了我

(base) C:\Users\shashi>conda update scikit-learn
Solving environment: done


==> WARNING: A newer version of conda exists. <==
  current version: 4.5.5
  latest version: 4.6.9

Please update conda by running

    $ conda update -n base -c defaults conda

（基本）C:\Users\shashi>conda更新scikit学习
解决环境：完成
==>警告：存在较新版本的conda。你有一个名为
pytest.py
的文件吗？同上…….你有一个名为
pytest.py
的文件吗？同上。。。。。。。。。。。
(base) C:\Users\shashi>pip install scikit-learn
Collecting scikit-learn
  Downloading https://files.pythonhosted.org/packages/d3/fa/b50821115c16e9b8ca307d3788e3dd1ec71cade3e564953ed7330a1fa3e0/scikit_learn-0.20.3-cp35-cp35m-win_amd64.whl (4.8MB)
    100% |################################| 4.8MB 546kB/s

Requirement already satisfied: scipy>=0.13.3 in d:\anaconda_details\lib\site-packages (from scikit-learn) (1.1.0)
Requirement already satisfied: numpy>=1.8.2 in d:\anaconda_details\lib\site-packages (from scikit-learn) (1.15.2)
twisted 18.7.0 requires PyHamcrest>=1.9.0, which is not installed.

Installing collected packages: scikit-learn

Could not install packages due to an EnvironmentError: [WinError 5] Access is denied: 'D:\\Anaconda_details\\Lib\\site-packages\\sklearn\\feature_extraction\\_hashing.cp35-win_amd64.pyd'
Consider using the `--user` option or check the permissions.

You are using pip version 18.0, however version 19.0.3 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.

(base) C:\Users\shashi>conda update scikit-learn
Solving environment: done


==> WARNING: A newer version of conda exists. <==
  current version: 4.5.5
  latest version: 4.6.9

Please update conda by running

    $ conda update -n base -c defaults conda