I have installed the nltk package. Following that I am trying to download the supporting packages using nltk.download() and am getting error: [Errno 11001] getaddrinfo My machine / software details are: OS: Windows 8.1 Python: 3.3.4 NLTK Package: 3.0 Below are the commands run in python: It looks like it is g…
Tag: python-3.x
Python: reduce (list of strings) -> string
I expected something like ‘a.b.c.d’ or ‘abcd’. Somehow, can’t explain the results. There are similar questions here, but not quite like this one. Answer The result of executing the function passed as the first parameter, will be the first parameter to that function in the next it…
Replacing tags of one kind with tags of another in BeautifulSoup
I have a collection of HTML files. I wish to iterate over them, one by one, editing the mark-up of a particular class. The code I wish to edit is of the following form, using the following class names : This can occur multiple times in the same document, with different text instead of “Put me Elsewhere&…
Find the column name of the second largest value of each row in a Pandas DataFrame
I am trying to find column name associated with the largest and second largest values in a DataFrame, here’s a simplified example (the real one has over 500 columns): Needs to become: I can find the column name with the largest value (i,e, 1larg above) with idxmax, but how can I find the second largest?…
How to make a variable inside a try/except block public?
How can I make a variable inside the try/except block public? This code returns an error How can I make the variable text available outside of the try/except block? Answer try statements do not create a new scope, but text won’t be set if the call to url lib.request.urlopen raises the exception. You pro…
Python “raise from” usage
What’s the difference between raise and raise from in Python? which yields and which yields Answer The difference is that when you use from, the __cause__ attribute is set and the message states that the exception was directly caused by. If you omit the from then no __cause__ is set, but the __context__…
How can I read exactly one response chunk with python’s http.client?
Using http.client in Python 3.3+ (or any other builtin python HTTP client library), how can I read a chunked HTTP response exactly one HTTP chunk at a time? I’m extending an existing test fixture (written in python using http.client) for a server which writes its response using HTTP’s chunked tran…
Module dependency graph in Python 3
How do I graph module dependencies in Python 3? I found snakefood, but it seems to only work with Python 2. Answer I built a tool based on pydeps here.
ImproperlyConfigured: There are duplicate field(s) in PackageAdmin.fieldsets
I have a very simple model : here is the admin.py : This implementation give me the following error : Any idea why ? If I let the second ‘fields’ empty, I don’t get the error. But if I let the first ‘fields’ empty, I still have this error. Answer Björn Kristinsson did solve my is…
Tracking how many elements processed in generator
I have a problem in which I process documents from files using python generators. The number of files I need to process are not known in advance. Each file contain records which consumes considerable amount of memory. Due to that, generators are used to process records. Here is the summary of the code I am wo…