Problem with execution of a loop time with List

every time when I run this bellow code,the output is different from before.
can any one explain why it happened.

%%timeit -n1 -r10
for i in range (1000000):
    my_list=["Lets","see","what","time","it","takes","to","execute"]
The Output is same.
Use:    print(i,my_list)   in the loop to see it.