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Bogus mutation: "* 1." -> "/ 1."

See original GitHub issue


-        Z_available = molinit['elez'] * molinit['real'] * 1.
+        Z_available = molinit['elez'] * molinit['real'] / 1.

mutmut version 1.5.1

Issue Analytics

  • State:closed
  • Created 4 years ago
  • Comments:5 (3 by maintainers)

github_iconTop GitHub Comments

mattwelborncommented, Sep 7, 2019

Thanks for the quick response!

The problem is that this mutation causes a false positive for every standard type. For numeric types – I tested int, float, bool and corresponding numpy types – * 1. and / 1. give the same result (e.g. 42 * 1. == 42 / 1.). For other types – I tested list, set, str, dict, and None — both * 1. and / 1. cause a TypeError.

boxedcommented, Sep 7, 2019

Cool! Always happy to hear people are using mutmut. Hope it goes well and I’d love to hear any more feedback you might have.

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