python安装pytest

1、python安装pytest，需要的插件

建议下载最新版本

atomicwrites
attrs
colorama
importlib_metadata
more_itertools
packaging
pluggy
py
pyparsing
six
wcwidth
zipp
pytest

或者：

链接：https://pan.baidu.com/s/109YcYMBRxwAAoHFIXoVAZA
提取码：dmnt

2、下载地址

https://pypi.org/project/pluggy/#files

 3、安装

pip install xxxx(插件全名)

4、查看是否安装成功

在控制台输入Python

接着输入 import pytest，如果不给报错，就证明安装成功

5、报错

Traceback (most recent call last):
  File "D:/java/idea/workSpaces/test/pythonWeb/webmoutrs/com_pytest/test_pytest01.py", line 1, in <module>
    import pytest
  File "D:pythonpythonRootlibsite-packagespytest.py", line 8, in <module>
    from _pytest.assertion import register_assert_rewrite
  File "D:pythonpythonRootlibsite-packages\_pytestassertion\__init__.py", line 13, in <module>
    from _pytest.assertion import rewrite
  File "D:pythonpythonRootlibsite-packages\_pytestassertion
ewrite.py", line 24, in <module>
    from _pytest.assertion import util
  File "D:pythonpythonRootlibsite-packages\_pytestassertionutil.py", line 11, in <module>
    import _pytest._code
  File "D:pythonpythonRootlibsite-packages\_pytest\_code\__init__.py", line 7, in <module>
    from .code import Code  # noqa
  File "D:pythonpythonRootlibsite-packages\_pytest\_codecode.py", line 15, in <module>
    import pluggy
  File "D:pythonpythonRootlibsite-packagespluggy\__init__.py", line 16, in <module>
    from .manager import PluginManager, PluginValidationError
  File "D:pythonpythonRootlibsite-packagespluggymanager.py", line 6, in <module>
    import importlib_metadata
  File "D:pythonpythonRootlibsite-packagesimportlib_metadata\__init__.py", line 471, in <module>
    __version__ = version(__name__)
  File "D:pythonpythonRootlibsite-packagesimportlib_metadata\__init__.py", line 438, in version
    return distribution(package).version
  File "D:pythonpythonRootlibsite-packagesimportlib_metadata\__init__.py", line 411, in distribution
    return Distribution.from_name(package)
  File "D:pythonpythonRootlibsite-packagesimportlib_metadata\__init__.py", line 179, in from_name
    dists = resolver(name)
  File "<frozen importlib._bootstrap_external>", line 1382, in find_distributions
  File "D:pythonpythonRootlibimportlibmetadata.py", line 400, in find_distributions
    found = cls._search_paths(context.pattern, context.path)
AttributeError: 'str' object has no attribute 'pattern'

Process finished with exit code 1

由报错信息显示三个地方的site-packages出错：

D:pythonpythonRootlibsite-packagesimportlib_metadata\__init__.py"

"D:pythonpythonRootlibsite-packagespluggy\_init__.py",

"D:pythonpythonRootlibsite-packages\_pytestassertion\__init__.py"

解决方法：
查看pytest所依赖的这三个包的版本，将其更新至需要版本