python(38): pip库安装not a supported *on this platform，查找可支持的库版本方法

方法1：

win32常用：
import pip;
print(pip.pep425tags.get_supported())

amd64常用：

import pip._internal
print(pip._internal.pep425tags.get_supported())
或
import pip._internal.pep425tags
或
import wheel.pep425tags as w
 

方法2：

import wheel as w

w..pep425tags.get_supported()

方法3：

使用源码包安装 （推荐）

例： https://pypi.org/project/simplejson/#filesx

下载.tar.gz文件， 解压缩， 运行python setup.py install 进行安装

豆瓣源：https://pypi.doubanio.com/simple/

方法4：

python -m pip debug --verbose

打印可以看出支持的版本清单

(base) C:\Users\25208>python -m pip debug --verbose
WARNING: This command is only meant for debugging. Do not use this with automation for parsing and getting these details, since the output and options of this command may change without notice.
pip version: pip 21.0.1 from C:\ProgramData\Anaconda3\lib\site-packages\pip (python 3.8)
sys.version: 3.8.8 (default, Apr 13 2021, 15:08:03) [MSC v.1916 64 bit (AMD64)]
sys.executable: C:\ProgramData\Anaconda3\python.exe
sys.getdefaultencoding: utf-8
sys.getfilesystemencoding: utf-8
locale.getpreferredencoding: cp936
sys.platform: win32
sys.implementation:
  name: cpython
'cert' config value: Not specified
REQUESTS_CA_BUNDLE: None
CURL_CA_BUNDLE: None
pip._vendor.certifi.where(): C:\ProgramData\Anaconda3\lib\site-packages\pip\_vendor\certifi\cacert.pem
pip._vendor.DEBUNDLED: False
vendored library versions:
  appdirs==1.4.4
  CacheControl==0.12.6
  colorama==0.4.4
  contextlib2==0.6.0.post1 (Unable to locate actual module version, using vendor.txt specified version)
  distlib==0.3.1
  distro==1.5.0 (Unable to locate actual module version, using vendor.txt specified version)
  html5lib==1.1
  msgpack==1.0.2 (Unable to locate actual module version, using vendor.txt specified version)
  packaging==20.9
  pep517==0.9.1
  progress==1.5
  pyparsing==2.4.7
  requests==2.25.1
  certifi==2020.12.05
  chardet==4.0.0
  idna==2.10
  urllib3==1.26.2
  resolvelib==0.5.4
  retrying==1.3.3 (Unable to locate actual module version, using vendor.txt specified version)
  setuptools==44.0.0 (Unable to locate actual module version, using vendor.txt specified version)
  six==1.15.0
  toml==0.10.2
  webencodings==0.5.1 (Unable to locate actual module version, using vendor.txt specified version)
Compatible tags: 30
  cp38-cp38-win_amd64  
  cp38-abi3-win_amd64
  cp38-none-win_amd64
  cp37-abi3-win_amd64
  cp36-abi3-win_amd64
  cp35-abi3-win_amd64
  cp34-abi3-win_amd64
  cp33-abi3-win_amd64
  cp32-abi3-win_amd64
  py38-none-win_amd64
  py3-none-win_amd64
  py37-none-win_amd64
  py36-none-win_amd64
  py35-none-win_amd64
  py34-none-win_amd64
  py33-none-win_amd64
  py32-none-win_amd64
  py31-none-win_amd64
  py30-none-win_amd64
  cp38-none-any
  py38-none-any
  py3-none-any
  py37-none-any
  py36-none-any
  py35-none-any
  py34-none-any
  py33-none-any
  py32-none-any
  py31-none-any
  py30-none-any