# 第六週3/21

### 追蹤程式碼(trace)
例子：

A = [1,2,3]
y = 0
for x in A
    y = y + x
    
print(y)

| | 1 | 2 | 3 |
| --- | --- | --- | --- |
| x | 1 | 2 | 3 |
| y | 1 | 3 | 6 |