[python] savetxt (numpty에 있는 함수로 list를 text로 저장할 때 사용가능)

https://docs.scipy.org/doc/numpy/reference/generated/numpy.savetxt.html

https://stackoverflow.com/questions/3685265/how-to-write-a-multidimensional-array-to-a-text-file

np.savetxt(path, array, output format)

For example, 

np.savetxt("file.txt", res, fmt="%.6f")