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EmilyGorcenski's profile
Emily G
Emily G
Emily G
Verified account
@EmilyGorcenski

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Emily GVerified account

@EmilyGorcenski

Lead Data Scientist, activist, survivor. Was actually assaulted by an actual right-wing terrorist. Opinions belong only to me, especially the bad ones. she/they

Deep Space Nine
emilygorcenski.com
Joined June 2013

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    1. Emily G‏Verified account @EmilyGorcenski 18 Sep 2017

      Example: pandas has a Timedelta subclass. I want to get the number of hours from a given Timedelta. I have two options:

      1 reply 0 retweets 8 likes
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    2. Emily G‏Verified account @EmilyGorcenski 18 Sep 2017

      First, break it into components, convert each component to hours, and sum them.

      1 reply 0 retweets 8 likes
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    3. Emily G‏Verified account @EmilyGorcenski 18 Sep 2017

      Or second: divide by a Timedelta representing 1 hour and get a floating point (or an integer!) as my return. This is obviously way less code

      1 reply 0 retweets 9 likes
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    4. Emily G‏Verified account @EmilyGorcenski 18 Sep 2017

      But this is also nonsensical.

      2 replies 0 retweets 8 likes
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    5.  🎃 🍂 eevee  🍂 🎃‏ @eevee 18 Sep 2017
      Replying to @EmilyGorcenski

      is... it? that sounds like an appropriate use of division

      1 reply 0 retweets 3 likes
    6. Emily G‏Verified account @EmilyGorcenski 18 Sep 2017
      Replying to @eevee

      The semantics don't fit at all.

      1 reply 0 retweets 1 like
    7.  🎃 🍂 eevee  🍂 🎃‏ @eevee 18 Sep 2017
      Replying to @EmilyGorcenski

      you want to know how many hours are in this timespan; division means "how many X are in this Y"

      2 replies 0 retweets 2 likes
    8. Emily G‏Verified account @EmilyGorcenski 18 Sep 2017
      Replying to @eevee

      Ehhh.... division of two Subclasses doesn't make sense. Why should I believe __div__ is even supported?

      4 replies 0 retweets 2 likes
    9. Félix Saparelli‏ @passcod 18 Sep 2017
      Replying to @EmilyGorcenski @eevee

      That's an odd way to see it. Isn't a duration a scalar? Regardless of whether it's an object underneath or a primitive

      1 reply 0 retweets 2 likes
    10. Emily G‏Verified account @EmilyGorcenski 18 Sep 2017
      Replying to @passcod @eevee

      In this context, it is not a scalar quantity.

      1 reply 0 retweets 0 likes
      Emily G‏Verified account @EmilyGorcenski 18 Sep 2017
      Replying to @EmilyGorcenski @passcod @eevee

      For instance, we may do the following: (a - b) / pd.Timedelta(hours=12) But not (a - b) * pd.Timedelta(hours=1/12)

      1:27 PM - 18 Sep 2017
      2 replies 0 retweets 0 likes
        1. New conversation
        2.  🎃 🍂 eevee  🍂 🎃‏ @eevee 18 Sep 2017
          Replying to @EmilyGorcenski @passcod

          sure. the former results in a unitless quantity; the latter results in time squared, which timedelta cannot represent

          2 replies 0 retweets 2 likes
        3. Emily G‏Verified account @EmilyGorcenski 18 Sep 2017
          Replying to @eevee @passcod

          Right, which is not the definition of a scalar.

          2 replies 0 retweets 0 likes
        4. Emily G‏Verified account @EmilyGorcenski 18 Sep 2017
          Replying to @EmilyGorcenski @eevee @passcod

          Actually I know of no algebra upon which addition and subtraction and *division* is defined but multiplication is not... 🤔

          2 replies 0 retweets 0 likes
        5.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 18 Sep 2017
          Replying to @EmilyGorcenski @eevee @passcod

          Python doesn't have a timesquared type so it omits that operator. perhaps this is an argument for actual units but those are complicated

          1 reply 0 retweets 3 likes
        6. Emily G‏Verified account @EmilyGorcenski 18 Sep 2017
          Replying to @erincandescent @oshepherd and

          Indeed they are. Which is why it would be a lot more semantically rich to provide methods to support the conversions.

          2 replies 0 retweets 0 likes
        7.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 18 Sep 2017
          Replying to @EmilyGorcenski @eevee @passcod

          Eh, I'd still want the division. Dividing periods by each other is useful.

          1 reply 0 retweets 1 like
        8. Emily G‏Verified account @EmilyGorcenski 18 Sep 2017
          Replying to @erincandescent @oshepherd and

          Sure sure -- I'm not saying *remove* that capability. But .to_hours() should be supported.

          1 reply 0 retweets 1 like
        9.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 18 Sep 2017
          Replying to @EmilyGorcenski @eevee @passcod

          I disagree - then you end up with to_years, to_months, to_weeks, to_days, to_hours, to_minutes, to_seconds, to_miliseconds...

          2 replies 0 retweets 1 like
        10. 3 more replies
        1. Félix Saparelli‏ @passcod 18 Sep 2017
          Replying to @EmilyGorcenski @eevee

          I guess I could expect multiplication to return an int or something

          0 replies 0 retweets 0 likes
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