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i was trying to debug some code the other day by throwing an error whenever a comparison was performed.  problem was, python will compare almost anything without crashing; it’ll compare lists to strings, integers to dicts, and not complain at all.

it took some googling, but i finally found something python didn’t like to compare: complex numbers.

observe:

>>> 1j*2
2j
>>> 1j*2 < b
Traceback (most recent call last):
File "“, line 1, in
TypeError: no ordering relation is defined for complex numbers


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One Response to “breaking pythons comparisons”

  1. on 23 Sep 2009 at 10:12 pm Charles Plager

    The reason that python doesn’t like to compare complex numbers is because there’s no way to do it. :-)

    Which is bigger, 5 or 6*J? 5 has a bigger real component, but 6J has a bigger magnitude. There’s no rule as to which one is right…

Did I get this wrong? Let me know!

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