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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Complex addition/subtraction is not commutative","articleBody":"```pycon\nPython 3.12.8 (Thu Oct 09 17:26:36 UTC 2025)\n[Graal, Oracle GraalVM, Java 25.0.1 (amd64)] on linux\nType \"help\", \"copyright\", \"credits\" or \"license\" for more information.\n\u003e\u003e\u003e x = 0; y = complex(0.0,-0.0)\n\u003e\u003e\u003e y+x\n-0j\n\u003e\u003e\u003e x+y\n0j\n```\n\nIt seems, this happens because specialization exists for complex+int (and complex+float) case, but not for int+complex:\nhttps://github.com/oracle/graalpython/blob/b12073bc3a6d11a07a54e49a87e07c22bf4dc1b0/graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/complex/ComplexBuiltins.java#L960-L971\n\nSame for subtraction:\nhttps://github.com/oracle/graalpython/blob/b12073bc3a6d11a07a54e49a87e07c22bf4dc1b0/graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/complex/ComplexBuiltins.java#L1077\n\nN.B.:  CPython before v3.14 had no special arithmetic rules for mixed-type operands (real values silently converted to complex type with a zero imaginary part).","author":{"url":"https://github.com/skirpichev","@type":"Person","name":"skirpichev"},"datePublished":"2025-12-23T10:26:29.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/585/graalpython/issues/585"}