Steven D'Aprano <steve+pyt...@pearwood.info> added the comment:

This behaviour is shared by all programming languages that use floating point 
numbers. For example, this is Ruby:

    [steve@ando ~]$ irb
    irb(main):001:0> 10 * 3.14 == 31.4
    => false
    irb(main):002:0> 10 * 3.14 - 31.4
    => 3.5527136788005e-15

It's not a bug in Python or even in floating point numbers. See the link in the 
tutorial that xtreak gave and the FAQ

https://docs.python.org/3/faq/design.html#why-am-i-getting-strange-results-with-simple-arithmetic-operations

----------
nosy: +steven.daprano
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39749>
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