Problems with yarn install

1. No yarn
NPM install – G yarn
2. An error is reported and phthon is not found

yarn install v1.22.17
warning package-lock.json found. Your project contains lock files generated by tools other than Yarn. It is advised not to mix package managers in order to avoid resolution inconsistencies caused by unsynch
ronized lock files. To clear this warning, remove package-lock.json.
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
warning " > [email protected]" has unmet peer dependency "css-loader@*".
warning " > [email protected]" has unmet peer dependency "webpack@^3.0.0 || ^4.1.0 || ^5.0.0-0".
warning " > [email protected]" has unmet peer dependency "webpack@^2.0.0 || ^3.0.0 || ^4.0.0".
warning " > [email protected]" has unmet peer dependency "webpack@^3.0.0 || ^4.0.0".
[4/4] Building fresh packages...
[7/7] ⠈ ant-design-vue
[-/7] ⠁ waiting...
[6/7] ⠁ node-sass
[4/7] ⠁ yorkie
error E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\node-sass: Command failed.
Exit code: 1
Command: node scripts/build.js
Arguments:
Directory: E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\node-sass
Output:
Building: E:\develop\node.js\node.exe E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\node-gyp\bin\node-gyp.js rebuild --verbose --libsass_ext= --libsass_cflags= --libsass_ldflags= --libs
ass_library=
gyp info it worked if it ends with ok
gyp verb cli [
gyp verb cli   'E:\\develop\\node.js\\node.exe',
gyp verb cli   'E:\\HuaDi\\Projects\\mrpc-inline\\ant-design-vue-supermap\\node_modules\\node-gyp\\bin\\node-gyp.js',
gyp verb cli   'rebuild',
gyp verb cli   '--verbose',
gyp verb cli   '--libsass_ext=',
gyp verb cli   '--libsass_cflags=',
gyp verb cli   '--libsass_ldflags=',
gyp verb cli   '--libsass_library='
gyp verb cli ]
gyp info using [email protected]
gyp info using [email protected] | win32 | x64
gyp verb command rebuild []
gyp verb command clean []
gyp verb clean removing "build" directory
gyp verb command configure []
gyp verb check python checking for Python executable "python2" in the PATH
gyp verb `which` failed Error: not found: python2
gyp verb `which` failed     at getNotFoundError (E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\which\which.js:13:12)
gyp verb `which` failed     at F (E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\which\which.js:68:19)
gyp verb `which` failed     at E (E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\which\which.js:80:29)
gyp verb `which` failed     at E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\which\which.js:89:16
gyp verb `which` failed     at E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\isexe\index.js:42:5
gyp verb `which` failed     at E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\isexe\windows.js:36:5
gyp verb `which` failed     at FSReqCallback.oncomplete (fs.js:175:21)
gyp verb `which` failed  python2 Error: not found: python2
gyp verb `which` failed     at getNotFoundError (E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\which\which.js:13:12)
gyp verb `which` failed     at F (E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\which\which.js:68:19)
gyp verb `which` failed     at E (E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\which\which.js:80:29)
gyp verb `which` failed     at E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\which\which.js:89:16
gyp verb `which` failed     at E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\isexe\index.js:42:5
gyp verb `which` failed     at E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\isexe\windows.js:36:5
gyp verb `which` failed     at FSReqCallback.oncomplete (fs.js:175:21) {
gyp verb `which` failed   code: 'ENOENT'
gyp verb `which` failed }
gyp verb check python checking for Python executable "python" in the PATH
gyp verb `which` failed Error: not found: python
gyp verb `which` failed     at getNotFoundError (E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\which\which.js:13:12)
gyp verb `which` failed     at F (E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\which\which.js:68:19)
gyp verb `which` failed     at E (E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\which\which.js:80:29)
gyp verb `which` failed     at E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\which\which.js:89:16
gyp verb `which` failed     at E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\isexe\index.js:42:5
gyp verb `which` failed     at E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\isexe\windows.js:36:5
gyp verb `which` failed     at FSReqCallback.oncomplete (fs.js:175:21)
gyp verb `which` failed  python Error: not found: python
gyp verb `which` failed     at getNotFoundError (E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\which\which.js:13:12)
gyp verb `which` failed     at F (E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\which\which.js:68:19)
gyp verb `which` failed     at E (E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\which\which.js:80:29)
gyp verb `which` failed     at E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\which\which.js:89:16
gyp verb `which` failed     at E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\isexe\index.js:42:5
gyp verb `which` failed     at E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\isexe\windows.js:36:5
gyp verb `which` failed     at FSReqCallback.oncomplete (fs.js:175:21) {
gyp verb `which` failed   code: 'ENOENT'
gyp verb `which` failed }
gyp verb could not find "python". checking python launcher
gyp verb could not find "python". guessing location
gyp verb ensuring that file exists: C:\Python27\python.exe
gyp ERR! configure error
gyp ERR! stack Error: Can't find Python executable "python", you can set the PYTHON env variable.
gyp ERR! stack     at PythonFinder.failNoPython (E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\node-gyp\lib\configure.js:484:19)
gyp ERR! stack     at PythonFinder.<anonymous> (E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\node-gyp\lib\configure.js:509:16)
gyp ERR! stack     at callback (E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\graceful-fs\polyfills.js:295:20)
gyp ERR! stack     at FSReqCallback.oncomplete (fs.js:175:21)
gyp ERR! System Windows_NT 10.0.19042
gyp ERR! command "E:\\develop\\node.js\\node.exe" "E:\\HuaDi\\Projects\\mrpc-inline\\ant-design-vue-supermap\\node_modules\\node-gyp\\bin\\node-gyp.js" "rebuild" "--verbose" "--libsass_ext=" "--libsass_cfla
gs=" "--libsass_ldflags=" "--libsass_library="
gyp ERR! cwd E:\HuaDi\Projects\mrpc-inline\ant-design-vue-supermap\node_modules\node-sass
gyp ERR! node -v v14.1.0

Solution:
1. Install low version node.js
2.npm install -g node-gyp
3.yarn install