Now can you get a reference to myInstance if you now only have access to methodReference? Answer If you are using Python 3: Otherwise: and by a similar token, for the class: For this kind of code discovery you should install iPython and use tab, for instance, in your case myReference.+TAB would give: Hence, y…
Tag: python
Embed R code in python
I need to make computations in a python program, and I would prefer to make some of them in R. Is it possible to embed R code in python ? Answer You should take a look at rpy (link to documentation here). This allows you to do: And then you can use the object called r to do computations just
How to get the index with the key in a dictionary?
I have the key of a python dictionary and I want to get the corresponding index in the dictionary. Suppose I have the following dictionary, Is there a combination of python functions so that I can get the index value of 1, given the key value ‘b’? I know it can be achieved with a loop or lambda (w…
dynamically adding callable to class as instance “method”
I implemented a metaclass that tears down the class attributes for classes created with it and builds methods from the data from those arguments, then attaches those dynamically created methods directly to the class object (the class in question allows for easy definition of web form objects for use in a web …
SQLAlchemy ORM select multiple entities from subquery
I need to query multiple entities, something like session.query(Entity1, Entity2), only from a subquery rather than directly from the tables. The docs have something about selecting one entity from a subquery but I can’t find how to select more than one, either in the docs or by experimentation. My use …
Pycuda Blocks and Grids to work with big datas
I need help to know the size of my blocks and grids. I’m building a python app to perform metric calculations based on scipy as: Euclidean distance, Manhattan, Pearson, Cosine, joined other. The project is PycudaDistances. It seems to work very well with small arrays. When I perform a more exhaustive te…
How to set self.maxDiff in nose to get full diff output?
When using nose 1.2.1 with Python 3.3.0, I sometimes get an error message similar to the following one In many situations, to figure out what the error really is, I need to see the full diff output. However, I have no idea of how to set that self.maxDiff. Googling for nose and maxDiff does not help. With the …
universal python library for internalization and translation
I need to internationalize and translate python application. I look forward for some dictionary collection resides in additional resource files that could be switched runtime and used smoothly inside python code. I’ve searched stackoverflow.com for similar tools but find only platform-specific libraries…
Python subprocess and user interaction
I’m working on a GUI front end in Python 2.6 and usually it’s fairly simple: you use subprocess.call() or subprocess.Popen() to issue the command and wait for it to finish or react to an error. What do you do if you have a program that stops and waits for user interaction? For example, the program…
Shell – Trying to output last portion of a logfile (Time-stamp is the separator)
I would like to read in a logfile into shell, and output the last logged event that had occurred. These logs are selenium-python automated test results that I am using in larger script. This script requires the last chunk of the log. Here is an example of one of the last logged events from an example output f…