Struggled in Python Interview: Great at Coding, Poor at Reading Code

I want to tell you about the most embarrassing 45 minutes of my developer career. I had been practicing LeetCode for three months. Easy problems, done. Most mediums, done. I felt ready. The interviewer shared their screen and showed me this: x = [1, 2, 3, 4, 5] y = x y += [6, 7] print(x) print(y) I