Python: Write two lists into two column text file

Question

Say I have two lists: a=[1,2,3] b=[4,5,6] I want to write them into a text file such that I obtain a two column text file:

Answer 1

It exits a straightway to save and stack same vectors length in columns. To do so use the concatenate function, you can then stack 3,4 or N vectors in columns delimitered by a tab.

np.savetxt('experimental_data_%s_%.1fa_%dp.txt'%(signal,angle,p_range), np.c_[DCS_exp, p_exp], delimiter="\t")