Given the following integers and calculation This results in: How can I round the output to an integer? Answer Somewhere else in your code you have something that looks like this: Then when you write that is interpreted as meaning a function call on the object bound to round, which is an int. And that fails. The problem is whatever
How do I change a raster’s geotransform with GDAL?
I’m trying to use GDAL to set the geotransform of a new raster that I’ve created by following the steps outlined in the GDAL API Tutorial. The dataset.SetGeoTransform() documentation says that this should set the affine transformation coefficients (which, according to the dataset.GetGeoTransform() documentation is set to [0, 1, 0, 0, 0, 1] by default), but as you can see
Setting a default value in sqlalchemy
I would like to set a column default value that is based on another table in my SQLAlchemy model. Currently I have this: What I need is (roughly) this: How can I implement this in SQLAlchemy? Answer The documentation gives the following possibilities for default: A scalar, Python callable, or ClauseElement representing the default value for this column, which will
django icontains with __in lookup
So I want to find any kind of matching given some fields, so for example, this is what I would like to do: sadly it is not possible to mix icontains and the __in lookup. It seems to be a pretty complex query so if at least I could ignore case the name that would be enough, for example: Any
best way to preserve numpy arrays on disk
I am looking for a fast way to preserve large numpy arrays. I want to save them to the disk in a binary format, then read them back into memory relatively fastly. cPickle is not fast enough, unfortunately. I found numpy.savez and numpy.load. But the weird thing is, numpy.load loads a npy file into “memory-map”. That means regular manipulating of
Convert an IP string to a number and vice versa
How would I use python to convert an IP address that comes as a str to a decimal number and vice versa? For example, for the IP 186.99.109.000 <type’str’>, I would like to have a decimal or binary form that is easy to store in a database, and then retrieve it. Answer converting an IP string to long integer: the
Printing Lists as Tabular Data
I am quite new to Python and I am now struggling with formatting my data nicely for printed output. I have one list that is used for two headings, and a matrix that should be the contents of the table. Like so: Note that the heading names are not necessarily the same lengths. The data entries are all integers, though.
Python Regex to find a string in double quotes within a string
I’m looking for a code in python using regex that can perform something like this Input: Regex should return “String 1” or “String 2” or “String3” Output: String 1,String2,String3 I tried r'”*”‘ Answer Here’s all you need to do: result: As pointed out by Li-aung Yip: To elaborate, .+? is the “non-greedy” version of .+. It makes the regular expression
Using PIL to turn a RGB image into a pure black and white image
I’m using the Python Imaging Library for some very simple image manipulation, however I’m having trouble converting a greyscale image to a monochrome (black and white) image. If I save after changing the image to greyscale (convert(‘L’)) then the image renders as you would expect. However, if I convert the image to a monochrome, single-band image it just gives me
Count occurrences of a couple of specific words
I have a list of words, lets say: [“foo”, “bar”, “baz”] and a large string in which these words may occur. I now use for every word in the list the “string”.count(“word”) method. This works OK, but seems rather inefficient. For every extra word added to the list the entire string must be iterated over an extra time. Is their