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_awbery_'s profile
🎃 Pum’dzin 🥧 Piemo 🎃
🎃 Pum’dzin 🥧 Piemo 🎃
 🎃 Pum’dzin  🥧 Piemo  🎃
@_awbery_

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 🎃 Pum’dzin  🥧 Piemo  🎃

@_awbery_

(functional(itinerant)) Intertwingularitarian

Chania
Joined December 2016

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     🎃 Pum’dzin  🥧 Piemo  🎃‏ @_awbery_ Oct 9

    Discovered today that there’s no inbuilt nCr function in any of the popular Python modules. Tried itertools, numpy, sciPy This can’t be true? What am I missing? Seems odd to have write it out using math.factorial or use a helper function. Maybe I’m abnormally lazy.

    10:00 AM - 9 Oct 2018
    • 1 Like
    • Robin Taylor
    2 replies 0 retweets 1 like
      1. New conversation
      2. Dan Garfield‏ @danlistensto Oct 9
        Replying to @_awbery_

        yeah, that's how it is. itertools.combinations gives you subsequences. if you want the nCr number you have to implement it yourself. good responses on this SO question, gives a more efficient way than using factorialhttps://stackoverflow.com/questions/4941753/is-there-a-math-ncr-function-in-python …

        1 reply 0 retweets 1 like
      3.  🎃 Pum’dzin  🥧 Piemo  🎃‏ @_awbery_ Oct 9
        Replying to @danlistensto

        Glad to have it confirmed, thanks. Yes, I was looking for the nCr number function.

        1 reply 0 retweets 0 likes
      4. Dan Garfield‏ @danlistensto Oct 9
        Replying to @_awbery_

        it is surprising that it's not in the standard library. kinda goes against the "batteries included" design philosophy of Python to exclude it like this, even though its simple to implement it yourself.

        1 reply 0 retweets 0 likes
      5.  🎃 Pum’dzin  🥧 Piemo  🎃‏ @_awbery_ Oct 9
        Replying to @danlistensto

        Yeah, that’s why I asked publicly. I wondered if there were some less used mathy library I hadn’t come across yet. Easy enough to add it to my own modules, but just seemed odd.

        0 replies 0 retweets 0 likes
      6. End of conversation
      1. New conversation
      2. David R. MacIver‏ @DRMacIver Oct 9
        Replying to @_awbery_

        hmm. I'm 80% sure I've seen it somewhere. Let me see if I can refind it or whether my memory is lying to me.

        1 reply 0 retweets 1 like
      3. David R. MacIver‏ @DRMacIver Oct 9
        Replying to @DRMacIver @_awbery_

        https://docs.scipy.org/doc/scipy-0.15.1/reference/generated/scipy.misc.comb.html … ?

        1 reply 0 retweets 0 likes
      4.  🎃 Pum’dzin  🥧 Piemo  🎃‏ @_awbery_ Oct 9
        Replying to @DRMacIver

        Yay…I got an attribute error with scipy.misc or comb for integers, but this worked: https://docs.scipy.org/doc/scipy-0.19.1/reference/generated/scipy.misc.comb.html … Thanks! cc. @danlistensto for info

        1 reply 0 retweets 2 likes
      5. David R. MacIver‏ @DRMacIver Oct 9
        Replying to @_awbery_ @danlistensto

        You're probably seeing something like https://gist.github.com/DRMacIver/4dbf57071f9517dc767128b1dfd71d7f … ? This is due to shenanigans with how Python's module system works. Modules inside packages aren't available as attributes on the module until you've imported them.

        1 reply 0 retweets 1 like
      6.  🎃 Pum’dzin  🥧 Piemo  🎃‏ @_awbery_ Oct 9
        Replying to @DRMacIver @danlistensto

        Ah ok yes, I’ve run into this before. But it seems to be true for some modules, not others (eg numpy?) Or maybe I’m confused. Importing the misc module, I get a deprecation warning. But scipy.special does the trick nicely.pic.twitter.com/8oEM2Omxg8

        1 reply 0 retweets 1 like
      7. David R. MacIver‏ @DRMacIver Oct 9
        Replying to @_awbery_ @danlistensto

        Yeah the confusing thing about this behaviour is that once you've imported the module anywhere in your program, it becomes available on the package. Sometimes this happens because the module is used internally.

        1 reply 0 retweets 1 like
      8. David R. MacIver‏ @DRMacIver Oct 9
        Replying to @DRMacIver @_awbery_ @danlistensto

        The result is there's basically no rhyme or reason as to when it works, it just sometimes happens to, but it will always work if you import the module.

        0 replies 0 retweets 0 likes
      9. End of conversation

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