My system is a docker container of Ubuntu18.04.
I just clone the source repository and run "python setup.py install" or "make -j48". It will give a compile error like this:

/home/xxx/driver/pytorch/torch/csrc/Layout.cpp:69:1: error: cannot convert ‘std::nullptr_t’ to ‘Py_ssize_t {aka long int}’ in initialization
 };
 ^
caffe2/torch/CMakeFiles/torch_python.dir/build.make:350: recipe for target 'caffe2/torch/CMakeFiles/torch_python.dir/csrc/Layout.cpp.o' failed
make[2]: *** [caffe2/torch/CMakeFiles/torch_python.dir/csrc/Layout.cpp.o] Error 1
make[2]: *** Waiting for unfinished jobs....
/home/xxx/driver/pytorch/torch/csrc/Dtype.cpp:98:1: error: cannot convert ‘std::nullptr_t’ to ‘Py_ssize_t {aka long int}’ in initialization
 };
 ^
[ 96%] Linking CXX executable ../../../bin/TCPStoreTest
/home/xxx/driver/pytorch/torch/csrc/Device.cpp:218:1: error: cannot convert ‘std::nullptr_t’ to ‘Py_ssize_t {aka long int}’ in initialization
 };
 ^
/home/xxx/driver/pytorch/torch/csrc/TypeInfo.cpp:229:1: error: cannot convert ‘std::nullptr_t’ to ‘Py_ssize_t {aka long int}’ in initialization
 };
 ^
/home/xxx/driver/pytorch/torch/csrc/TypeInfo.cpp:279:1: error: cannot convert ‘std::nullptr_t’ to ‘Py_ssize_t {aka long int}’ in initialization
 };

I guess it's because of the init phase for nullptr, so I modify all nullptr /* tp_print */ to 0 /* tp_print*/, and it does work! I don't know this is the right way to fix, but anyway, I can use pytorch1.3 with Python3.8 now:)

Pytorch1.3 can't be compiled successfully with Python3.8.0 #28060

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