also mentioned in
pybox2d/pybox2d#106
None of the solutions above solved my problem...
Windows 10 - 64
Python 3.7
error is

E:\WINPYTHON_FULL_apr22\WPy64-3770\scripts>pip install box2d-py
Collecting box2d-py
Using cached box2d-py-2.3.8.tar.gz (374 kB)
Building wheels for collected packages: box2d-py
Building wheel for box2d-py (setup.py) ... error
ERROR: Command errored out with exit status 1:
command: 'E:\WINPYTHON_FULL_apr22\WPy64-3770\python-3.7.7.amd64\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\Users\sndr\AppData\Local\Temp\pip-install-051a0jhh\box2d-py\setup.py'"'"'; file='"'"'C:\Users\sndr\AppData\Local\Temp\pip-install-051a0jhh\box2d-py\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(file);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, file, '"'"'exec'"'"'))' bdist_wheel -d 'C:\Users\sndr\AppData\Local\Temp\pip-wheel-o6d1ycsj'
cwd: C:\Users\sndr\AppData\Local\Temp\pip-install-051a0jhh\box2d-py
Complete output (16 lines):
Using setuptools (version 46.0.0).
running bdist_wheel
running build
running build_py
creating build
creating build\lib.win-amd64-3.7
creating build\lib.win-amd64-3.7\Box2D
copying library\Box2D\Box2D.py -> build\lib.win-amd64-3.7\Box2D
copying library\Box2D_init_.py -> build\lib.win-amd64-3.7\Box2D
creating build\lib.win-amd64-3.7\Box2D\b2
copying library\Box2D\b2_init_.py -> build\lib.win-amd64-3.7\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: No such file or directory

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: 'E:\WINPYTHON_FULL_apr22\WPy64-3770\python-3.7.7.amd64\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\Users\sndr\AppData\Local\Temp\pip-install-051a0jhh\box2d-py\setup.py'"'"'; file='"'"'C:\Users\sndr\AppData\Local\Temp\pip-install-051a0jhh\box2d-py\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(file);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, file, '"'"'exec'"'"'))' install --record 'C:\Users\sndr\AppData\Local\Temp\pip-record-196k65d5\install-record.txt' --single-version-externally-managed --compile --install-headers 'E:\WINPYTHON_FULL_apr22\WPy64-3770\python-3.7.7.amd64\Include\box2d-py'
cwd: C:\Users\sndr\AppData\Local\Temp\pip-install-051a0jhh\box2d-py
Complete output (16 lines):
Using setuptools (version 46.0.0).
running install
running build
running build_py
creating build
creating build\lib.win-amd64-3.7
creating build\lib.win-amd64-3.7\Box2D
copying library\Box2D\Box2D.py -> build\lib.win-amd64-3.7\Box2D
copying library\Box2D_init_.py -> build\lib.win-amd64-3.7\Box2D
creating build\lib.win-amd64-3.7\Box2D\b2
copying library\Box2D\b2_init_.py -> build\lib.win-amd64-3.7\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: No such file or directory
----------------------------------------
ERROR: Command errored out with exit status 1: 'E:\WINPYTHON_FULL_apr22\WPy64-3770\python-3.7.7.amd64\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\Users\sndr\AppData\Local\Temp\pip-install-051a0jhh\box2d-py\setup.py'"'"'; file='"'"'C:\Users\sndr\AppData\Local\Temp\pip-install-051a0jhh\box2d-py\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(file);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, file, '"'"'exec'"'"'))' install --record 'C:\Users\sndr\AppData\Local\Temp\pip-record-196k65d5\install-record.txt' --single-version-externally-managed --compile --install-headers 'E:\WINPYTHON_FULL_apr22\WPy64-3770\python-3.7.7.amd64\Include\box2d-py' Check the logs for full command output.

E:\WINPYTHON_FULL_apr22\WPy64-3770\scripts>