I have a list of tuples in Python, and I have a conditional where I want to take the branch ONLY if the tuple is not in the list (if it is in the list, then I don't want to take the if branch)
if curr_x -1 > 0 and (curr_x-1 , curr_y) not in myList:
# Do Something
This is not really worki...
What do we say to the God of Death? "Not today!" I'm so glad I started printing stuff out before I fell into this trap with Decimal division by my very attempt to stop floating point errors.
The problem I have now is knowing what to do with Decimal('0.00001023405278724427660597873364'). That comes from the division of two DB columns stored as NUMERIC(24, 12) in SQLAlchemy. It looks like if I quantize that back to 12 d.p. I could potentially be losing a lot of precision, but I don't know how much of that figure is really necessary
.quantize(..., context=Context(traps=[Inexact])) is a bjooteefull API, by the way.
@roganjosh Well, do you actually have that precision in the first place? It's probably worth looking/estimating how precise the initial values are and then ballparking error propagation on it. Number of digits is usually just a very conservative upper bound on the precision.
My name is MisterMiyagi and I store values with less than ten significant binary digits in 64b floats. takes a seat, sips cheap coffee
I have one guiding principle, that I might need to take a truck delivery of 50 tonnes of sugar to a sweet factory and I need to divide that down to the fraction of a truckload that goes into a single sweet. It's the flimsiest of flimsy anecdotes I have to go on, but god knows what other clients might throw at the system
I suppose I could just not store the conversion at all in the DB and just calculate it on-the-fly but that seems unnecessarily heavy. Bleugh, this was supposed to be the easy part :(
If it makes you feel better, I've spent the last hour tracking down why I'm out by an order of magnitude on one of my calcs. Turns out, I decided there were 10,000 ml in a litre when I wrote my base JSON that bootstraps my database.
I have a list of tuples in Python, and I have a conditional where I want to take the branch ONLY if the tuple is not in the list (if it is in the list, then I don't want to take the if branch)
if curr_x -1 > 0 and (curr_x-1 , curr_y) not in myList:
# Do Something
This is not really worki...
