Message 230445 - Python tracker

Here is yet one example.

x = 1; y = 0; z = 0
(
    1/x +
    1/y +
    1/z
)

The traceback looks correct:

Traceback (most recent call last):
  File "1.py", line 4, in <module>
    1/y +
ZeroDivisionError: division by zero

But for following code:

x = 0; y = 1; z = 0
(
    1/x +
    1/y +
    1/z
)

the traceback is the same and it is totally wrong.

This is because generated bytecode is:

  1           0 LOAD_CONST               0 (0)
              3 STORE_NAME               0 (x)
              6 LOAD_CONST               1 (1)
              9 STORE_NAME               1 (y)
             12 LOAD_CONST               0 (0)
             15 STORE_NAME               2 (z)

  4          18 LOAD_CONST               1 (1)
             21 LOAD_NAME                0 (x)
             24 BINARY_TRUE_DIVIDE
             25 LOAD_CONST               1 (1)
             28 LOAD_NAME                1 (y)
             31 BINARY_TRUE_DIVIDE
             32 BINARY_ADD

  5          33 LOAD_CONST               1 (1)
             36 LOAD_NAME                2 (z)
             39 BINARY_TRUE_DIVIDE
             40 BINARY_ADD
             41 POP_TOP
             42 LOAD_CONST               2 (None)
             45 RETURN_VALUE

1/x and 1/y have the same line number.