Use `math.isclose` Instead of Direct Equality for Floats

[pixeebot[bot]]

In most programming languages, floating point arithmetic is imprecise due to the way floating point numbers are stored as binary representations. Moreover, the result of calculations with floats can vary based on when rounding happens. Using equality or inequality to compare floats or their operations will almost always be imprecise and lead to bugs.

For these reasons, this codemod changes any operations involving equality or inequality with floats to the recommended math.isclose function. This codemod uses the default parameter values rel_tol=1e-09 and abs_tol=0.0 but makes them explicit as a starting point for you to consider depending on your calculation needs.

Our changes look like the following:

+import math
+
 def foo(a, b):
-    return a == b - 0.1
+    return math.isclose(a, b - 0.1, rel_tol=1e-09, abs_tol=0.0)

More reading

* [https://docs.python.org/3/tutorial/floatingpoint.html#floating-point-arithmetic-issues-and-limitations](https://docs.python.org/3/tutorial/floatingpoint.html#floating-point-arithmetic-issues-and-limitations) * [https://docs.python.org/3/library/math.html#math.isclose](https://docs.python.org/3/library/math.html#math.isclose)

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💬Feedback | 👥Community | 📚Docs | Codemod ID: pixee:python/fix-float-equality

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[pep8speaks]

Hello @pixeebot[bot]! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file openage/convert/processor/conversion/aoc/ability_subprocessor.py:

Line 7093:80: E501 line too long (83 > 79 characters)

[git-greetings[bot]]

PR Details of @pixeebot[bot] in SFTtech-openage :	OPEN	CLOSED	TOTAL
2	4	6

[pixeebot[bot]]

I'm confident in this change, but I'm not a maintainer of this project. Do you see any reason not to merge it?

If this change was not helpful, or you have suggestions for improvements, please let me know!

[pixeebot[bot]]

Just a friendly ping to remind you about this change. If there are concerns about it, we'd love to hear about them!

[pixeebot[bot]]

This change may not be a priority right now, so I'll close it. If there was something I could have done better, please let me know!

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