Batuhan Taskaya <[email protected]> added the comment:
Code objects themselves supports equality comparisons,
>>> compile("print(1)", "<stdin>", "eval") == compile("print(1)", "<stdin>",
>>> "eval")
True
So this patch basically compares the underlying code objects with 2 Bytecode
specific attribute, first_line and current_offset. So these objects will be
equal
>>> import dis
>>> dis.Bytecode("print(1)") == dis.Bytecode("print(1)")
True
but these won't
>>> dis.Bytecode("print(1)") == dis.Bytecode("print(1)", first_line=2)
False
>>> dis.Bytecode("print(1)") == dis.Bytecode("print(1)", current_offset=12)
False
A simple example that would be problamatic in .dis() method is code objects
that contains other code objects
import dis
source = "def x(a, b): print(1)"
print(dis.Bytecode(source).dis())
print(dis.Bytecode(source).dis())
print(dis.Bytecode(source).dis() == dis.Bytecode(source).dis())
1 0 LOAD_CONST 0 (<code object x at
!!0x7fd76239aee0!!, file "<disassembly>", line 1>)
2 LOAD_CONST 1 ('x')
4 MAKE_FUNCTION 0
6 STORE_NAME 0 (x)
8 LOAD_CONST 2 (None)
10 RETURN_VALUE
1 0 LOAD_CONST 0 (<code object x at
!!0x7fd7623b76c0!!, file "<disassembly>", line 1>)
2 LOAD_CONST 1 ('x')
4 MAKE_FUNCTION 0
6 STORE_NAME 0 (x)
8 LOAD_CONST 2 (None)
10 RETURN_VALUE
False
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Python tracker <[email protected]>
<https://bugs.python.org/issue39902>
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