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onnx build script always depends on python2

See original GitHub issue

OS: fedora 27 build steps:

dnf install -y curl eigen3-devel gcc gcc-c++ zlib-devel cmake make ninja-build git python3-devel python3-numpy libunwind icu aria2 rsync python3-setuptools python3-wheel
export ONNX_ML=1
aria2c --download-result=hide -d /tmp/src  https://github.com/onnx/onnx/archive/v1.2.2.tar.gz
tar -xf /tmp/src/onnx-1.2.2.tar.gz -C /tmp/src
cd /tmp/src/onnx-1.2.2
python3 setup.py  bdist_wheel

output:

[  5%] Running C++ protocol buffer compiler on /tmp/src/onnx-1.2.2/.setuptools-cmake-build/onnx/onnx-ml.proto
/usr/bin/env: ‘python’: No such file or directory
--mypy_out: protoc-gen-mypy: Plugin failed with status code 127.
gmake[2]: *** [CMakeFiles/gen_onnx_proto.dir/build.make:62: onnx/onnx-ml.pb.cc] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:100: CMakeFiles/gen_onnx_proto.dir/all] Error 2
gmake: *** [Makefile:130: all] Error 2
Traceback (most recent call last):
  File "setup.py", line 327, in <module>
    'backend-test-tools = onnx.backend.test.cmd_tools:main',
  File "/usr/lib/python3.6/site-packages/setuptools/__init__.py", line 129, in setup
    return distutils.core.setup(**attrs)
  File "/usr/lib64/python3.6/distutils/core.py", line 148, in setup
    dist.run_commands()
  File "/usr/lib64/python3.6/distutils/dist.py", line 955, in run_commands
    self.run_command(cmd)
  File "/usr/lib64/python3.6/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "/usr/lib/python3.6/site-packages/wheel/bdist_wheel.py", line 199, in run
    self.run_command('build')
  File "/usr/lib64/python3.6/distutils/cmd.py", line 313, in run_command
    self.distribution.run_command(command)
  File "/usr/lib64/python3.6/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "/usr/lib64/python3.6/distutils/command/build.py", line 135, in run
    self.run_command(cmd_name)
  File "/usr/lib64/python3.6/distutils/cmd.py", line 313, in run_command
    self.distribution.run_command(command)
  File "/usr/lib64/python3.6/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "setup.py", line 202, in run
    self.run_command('cmake_build')
  File "/usr/lib64/python3.6/distutils/cmd.py", line 313, in run_command
    self.distribution.run_command(command)
  File "/usr/lib64/python3.6/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "setup.py", line 196, in run
    subprocess.check_call(build_args)
  File "/usr/lib64/python3.6/subprocess.py", line 291, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['/usr/bin/cmake3', '--build', '.', '--', '-j', '8']' returned non-zero exit status 2.

I haven’t installed python 2. I only have python3. Therefore I cannot build onnx.