Dear All, Very Sorry for the my mistake here. I code here with mu question ... My Question: A,B=C,D=10,11 print(A,B,C,D) #(10,11,10,11) --> This is OK! a=1; b=2 a,b=b,a print(a,b) # (1,2) --> This is OK! x,y=y,x=2,3 print(x,y) # (3,2) --> Question: How to explain it? # Not understand this process. Pl explain ...