Oy mates, I am learning numpy on my own and getting a pretty good handle on it, a few concepts elude me even after reading the documentation though. I am trying to go through this matrix and make every second row have 10s all the way through it. The last line of code is incorrect. I know how to use
Tag: python
Access-Control-Allow-Origin in Django app
I’m developing a Phonegap app for my Django based app, but when trying to make Ajax calls I get this error: How can I make it so my Django app allows cross origin for some urls? Here’s my Ajax code: Answer Django by default does not provide the headers necessary to provide cross origin. The easies…
Apply format to a cell after being written in XlsxWriter
I work on python using XlsxWriter and I’ve been trying to solve this problem with no success: My app must create an Xlsx file in which data is shown in a table-like structure. That table has some empty cells. I’d like to set borders to some cells to make a grid for the table so I use: in order to
Socket Programming with Python server and Android client
I want to setup a socket interface. PC side runs a very simple socket server written in Python to test the connection: An Android client application will connect to PC: However, I cannot establish a connection between PC and Android device. Any idea to fix this? Answer As you haven’t detailed if youR…
Flask, setting JSON in a cookie, and decoding it on the client (in javascript)
I’m setting a cookie in Flask like follows : If i print json.dumps(someObject) on the server I get : On the client side it becomes : I want to decode it on a javascript client what format is it exactly ? I’d like to decode it and pass it to angular.fromJson(), it looks like there is at least unesc…
Get all keys in Redis database with python
There is a post about a Redis command to get all available keys, but I would like to do it with Python. Any way to do this? Answer Use scan_iter() scan_iter() is superior to keys() for large numbers of keys because it gives you an iterator you can use rather than trying to load all the keys into memory. I
Python: datetime64 issues with range
I am trying to have a vector of seconds between two time intervals: For some reason when I print range I get: So the length is 23401 which is what I want but definitely not the correct time interval. Why is that? Also, if I have a DataFrame df with a column of datetime64 format that looks like: Once I
Choose at random from combinations
I can make a list of all combinations using list(itertools.combinations(range(n), m)) but this will typically be very large. Given n and m, how can I choose a combination uniformly at random without first constructing a massive list?? Answer From http://docs.python.org/2/library/itertools.html#recipes
UnicodeDecodeError: ‘utf8’ codec can’t decode byte 0xa5 in position 0: invalid start byte
I am using Python-2.6 CGI scripts but found this error in server log while doing json.dumps(), Here , __getdata() function returns dictionary {} . Before posting this question I have referred this of question os SO. UPDATES Following line is hurting JSON encoder, I got a temporary fix for it But I am not s…
How can I subclass a Pandas DataFrame?
Subclassing Pandas classes seems a common need, but I could not find references on the subject. (It seems that Pandas developers are still working on it: Easier subclassing #60.) There are some SO questions on the subject, but I am hoping that someone here can provide a more systematic account on the current …