当我尝试安装gym[box2d]时，我得到以下错误：我尝试了：pip安装gym[box2d].在anaconda提示我安装了swig和gym[box2d]，但我在python3.9环境中编码，它仍然不工作.（我的文本编辑器是pycharm）gym已经安装.和

ERROR: Command errored out with exit status 1:
   command: 'C:\Users\hooman\AppData\Local\Programs\Python\Python39\python.exe' -u -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\hoom
an\\AppData\\Local\\Temp\\pip-install-_vo0km5i\\box2d-py_aea38b0da25341cf93e6a6c9d4b9d296\\setup.py'"'"'; __file__='"'"'C:\\Users\\hooman\\AppData\\Local\\Temp\\pi
p-install-_vo0km5i\\box2d-py_aea38b0da25341cf93e6a6c9d4b9d296\\setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else
 io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exe
c'"'"'))' bdist_wheel -d 'C:\Users\hooman\AppData\Local\Temp\pip-wheel-va_dgazk'
       cwd: C:\Users\hooman\AppData\Local\Temp\pip-install-_vo0km5i\box2d-py_aea38b0da25341cf93e6a6c9d4b9d296\
  Complete output (16 lines):
  Using setuptools (version 58.2.0).
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build\lib.win-amd64-3.9
  creating build\lib.win-amd64-3.9\Box2D
  copying library\Box2D\Box2D.py -> build\lib.win-amd64-3.9\Box2D
  copying library\Box2D\__init__.py -> build\lib.win-amd64-3.9\Box2D
  creating build\lib.win-amd64-3.9\Box2D\b2
  copying library\Box2D\b2\__init__.py -> build\lib.win-amd64-3.9\Box2D\b2
  running build_ext
  building 'Box2D._Box2D' extension
  swigging Box2D\Box2D.i to Box2D\Box2D_wrap.cpp
  swig.exe -python -c++ -IBox2D -small -O -includeall -ignoremissing -w201 -globals b2Globals -outdir library\Box2D -keyword -w511 -D_SWIG_KWARGS -o Box2D\Box2D_wr
ap.cpp Box2D\Box2D.i
  error: command 'swig.exe' failed: None
  ----------------------------------------
  ERROR: Failed building wheel for box2d-py
  Running setup.py clean for box2d-py
Failed to build box2d-py
Installing collected packages: box2d-py
    Running setup.py install for box2d-py ... error
    ERROR: Command errored out with exit status 1:
     command: 'C:\Users\hooman\AppData\Local\Programs\Python\Python39\python.exe' -u -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\ho
oman\\AppData\\Local\\Temp\\pip-install-_vo0km5i\\box2d-py_aea38b0da25341cf93e6a6c9d4b9d296\\setup.py'"'"'; __file__='"'"'C:\\Users\\hooman\\AppData\\Local\\Temp\\
pip-install-_vo0km5i\\box2d-py_aea38b0da25341cf93e6a6c9d4b9d296\\setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) el
se io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'e
xec'"'"'))' install --record 'C:\Users\hooman\AppData\Local\Temp\pip-record-yz4t1mq0\install-record.txt' --single-version-externally-managed --compile --install-he
aders 'C:\Users\hooman\AppData\Local\Programs\Python\Python39\Include\box2d-py'
         cwd: C:\Users\hooman\AppData\Local\Temp\pip-install-_vo0km5i\box2d-py_aea38b0da25341cf93e6a6c9d4b9d296\
    Complete output (16 lines):
    Using setuptools (version 58.2.0).
    running install
    running build
    running build_py
    creating build
    creating build\lib.win-amd64-3.9
    creating build\lib.win-amd64-3.9\Box2D
    copying library\Box2D\Box2D.py -> build\lib.win-amd64-3.9\Box2D
    copying library\Box2D\__init__.py -> build\lib.win-amd64-3.9\Box2D
    creating build\lib.win-amd64-3.9\Box2D\b2
    copying library\Box2D\b2\__init__.py -> build\lib.win-amd64-3.9\Box2D\b2
    running build_ext
    building 'Box2D._Box2D' extension
    swigging Box2D\Box2D.i to Box2D\Box2D_wrap.cpp
    swig.exe -python -c++ -IBox2D -small -O -includeall -ignoremissing -w201 -globals b2Globals -outdir library\Box2D -keyword -w511 -D_SWIG_KWARGS -o Box2D\Box2D_
wrap.cpp Box2D\Box2D.i
    error: command 'swig.exe' failed: None
    ----------------------------------------
ERROR: Command errored out with exit status 1: