This question already has answers here: Finding the average of a list (25 answers) Closed 12 months ago. Is there a built-in or standard library method in Python to calculate the arithmetic mean (one type of average) of a list of numbers? Answer I am not aware of anything in the standard library. However, you could use something like: In
Bad magic number error with ZipFile module in Python
I am using Python 2.7 on Windows 7 (64 bit). When I try to unzip a zip file with ZipFile module I get the following error:- WinRAR could extract the file I am trying to extract just fine. Here is the code I used to extract files from myzip.zip This code is working fine for many other zip files I
How do I create multiline comments in Python?
How do I make multi-line comments? Most languages have block comment symbols like: Answer You can use triple-quoted strings. When they’re not a docstring (the first thing in a class/function/module), they are ignored. (Make sure to indent the leading ”’ appropriately to avoid an IndentationError.) Guido van Rossum (creator of Python) tweeted this as a “pro tip”. However, Python’s style
Converting xml to dictionary using ElementTree
I’m looking for an XML to dictionary parser using ElementTree, I already found some but they are excluding the attributes, and in my case I have a lot of attributes. Answer Call as This works as long as you don’t actually have an attribute text; if you do, then change the third line in the function body to use a
sqlite3.OperationalError: unable to open database file
I get this error when setting up a server in Django. It is sqlite3 which means it should create the .db file but it doesn’t seem to be doing so. I’ve stipulated SQLite as the backend and an absolute file path for where to put it, but no luck. Is this a bug or am I doing something incorrect? (Was
Python split string in moving window
I have a string with digits like so – digit = “7316717” Now I want to split the string in such a way that the output is a moving window of 3 digits at a time. So I get – [“731”, “316”, “167”, “671”, “717”] How would the approach be? Straightforward way is to put in for-loop and iterate. But
A python web framework for google app engine
(Please note that this question and some of the answers are old) I want to use an existing python framework to develop an application on google appengine. It should be quick and easy to start and support test driven development practices in an easy way. Can you recommend a stack? What about django? Additional Information: There are several django ports,
How to to read a matrix from a given file?
I have a text file which contains matrix of N * M dimensions. For example the input.txt file contains the following: I need to write python script where in I can import the matrix. My current python script is: the output list comes like this I need to fetch the values in int form . If I try to type
Maximum and Minimum values for ints
How do I represent minimum and maximum values for integers in Python? In Java, we have Integer.MIN_VALUE and Integer.MAX_VALUE. See also: What is the maximum float in Python?. Answer Python 3 In Python 3, this question doesn’t apply. The plain int type is unbounded. However, you might actually be looking for information about the current interpreter’s word size, which will
Format a datetime into a string with milliseconds
How can I format a datetime object as a string with milliseconds? Answer To get a date string with milliseconds, use [:-3] to trim the last three digits of %f (microseconds): Or slightly shorter: