title: ERROR: Could not build wheels for tulipy which use PEP 517 and cannot be installed directly
body: <p>so I have checked every post that relates to this issue and I still can't seem to make this work. I am trying to install tulipy using pip on a Windows machine. I've installed numerous other pip based programs with no issues. I tried reinstalling VS Build Tools, but that doesn't seem to help either. I need tulipy for a project I'm working on, so I can't use any alternatives.</p>
  <pre><code>C:\Users\bette&gt;pip install tulipy --user
  Collecting tulipy
    Using cached tulipy-0.4.0.tar.gz (110 kB)
    Installing build dependencies ... done
    Getting requirements to build wheel ... done
      Preparing wheel metadata ... done
  Requirement already satisfied: numpy in c:\users\bette\appdata\roaming\python\python39\site-packages (from tulipy) (1.19.5)
  Building wheels for collected packages: tulipy
    Building wheel for tulipy (PEP 517) ... error
    ERROR: Command errored out with exit status 1:
     command: 'c:\python39\python.exe' 'C:\Users\bette\AppData\Roaming\Python\Python39\site-packages\pip\_vendor\pep517\_in_process.py' build_wheel 'C:\Users\bette\AppData\Local\Temp\tmpuwzd3c74'
         cwd: C:\Users\bette\AppData\Local\Temp\pip-install-gkcz217u\tulipy_8179e3516bd64c689a0168ed407c13fc
    Complete output (27 lines):
    running bdist_wheel
    running build
    running build_py
    creating build
    creating build\lib.win-amd64-3.9
    creating build\lib.win-amd64-3.9\tulipy
    copying tulipy\__init__.py -&gt; build\lib.win-amd64-3.9\tulipy
    running build_ext
    skipping 'tulipy/lib\__init__.c' Cython extension (up-to-date)
    building 'tulipy.lib' extension
    creating build\temp.win-amd64-3.9
    creating build\temp.win-amd64-3.9\Release
    creating build\temp.win-amd64-3.9\Release\libindicators
    creating build\temp.win-amd64-3.9\Release\tulipy
    creating build\temp.win-amd64-3.9\Release\tulipy\lib
    D:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\x86_amd64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -Ilibindicators -Itulipy/lib -IC:\Users\bette\AppData\Local\Temp\pip-build-env-nl5462ni\overlay\Lib\site-packages\numpy\core\include -Ic:\python39\include -Ic:\python39\include -ID:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE -ID:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\ATLMFC\INCLUDE -ID:\Windows Kits\10\include\10.0.17763.0\ucrt -ID:\Windows Kits\10\include\10.0.17763.0\shared -ID:\Windows Kits\10\include\10.0.17763.0\um -ID:\Windows Kits\10\include\10.0.17763.0\winrt /Tclibindicators/tiamalgamation.c /Fobuild\temp.win-amd64-3.9\Release\libindicators/tiamalgamation.obj
    tiamalgamation.c
    D:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\x86_amd64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -Ilibindicators -Itulipy/lib -IC:\Users\bette\AppData\Local\Temp\pip-build-env-nl5462ni\overlay\Lib\site-packages\numpy\core\include -Ic:\python39\include -Ic:\python39\include -ID:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE -ID:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\ATLMFC\INCLUDE -ID:\Windows Kits\10\include\10.0.17763.0\ucrt -ID:\Windows Kits\10\include\10.0.17763.0\shared -ID:\Windows Kits\10\include\10.0.17763.0\um -ID:\Windows Kits\10\include\10.0.17763.0\winrt /Tctulipy/lib\__init__.c /Fobuild\temp.win-amd64-3.9\Release\tulipy/lib\__init__.obj
    __init__.c
    c:\users\bette\appdata\local\temp\pip-build-env-nl5462ni\overlay\lib\site-packages\numpy\core\include\numpy\npy_1_7_deprecated_api.h(14) : Warning Msg: Using deprecated NumPy API, disable it with #define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION
    tulipy/lib\__init__.c(8102): error C2039: 'tp_print': is not a member of '_typeobject'
    c:\python39\include\cpython/object.h(193): note: see declaration of '_typeobject'
    tulipy/lib\__init__.c(10033): warning C4996: '_PyUnicode_get_wstr_length': deprecated in 3.3
    c:\python39\include\cpython/unicodeobject.h(446): note: see declaration of '_PyUnicode_get_wstr_length'
    tulipy/lib\__init__.c(10049): warning C4996: '_PyUnicode_get_wstr_length': deprecated in 3.3
    c:\python39\include\cpython/unicodeobject.h(446): note: see declaration of '_PyUnicode_get_wstr_length'
    error: command 'D:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC\\BIN\\x86_amd64\\cl.exe' failed with exit code 2
    ----------------------------------------
    ERROR: Failed building wheel for tulipy
  Failed to build tulipy
  ERROR: Could not build wheels for tulipy which use PEP 517 and cannot be installed directly
  </code></pre>