python
join list of lists in python
Is the a short syntax for joining a list of lists into a single list( or iterator) in python? For example I have a list as follows and I want to iterate over a,b and c. x = [["a","b"], ["c"]] The best I can come up with is as follows. result = [] [ result.extend(el) … Read more
How to check for valid email address?
All we are really doing is comparing the input string to one
gigantic regular expression. But building that regexp, and
ensuring its correctness, is made much easier by assembling it
from the “tokens” defined by the RFC. Each of these tokens is
tested in the accompanying unit test file.
How can I selectively escape percent (%) in Python strings?
I have the following code
Why am I seeing “TypeError: string indices must be integers”?
I’m playing with both learning Python and am trying to get GitHub issues into a readable form. Using the advice on How can I convert JSON to CSV?, I came up with this:
How to detect when a rectangular object, image or sprite is clicked
I’m trying to tell when a sprite, which must be part of a particular group (pygame.sprite.Group()), is clicked on. Currently I’ve tried creating a sprite which is just the mouses position and totally invisible, adding it to its own group, and using this code:
Why does this code for initializing a list of lists apparently link the lists together?
I intend to initialize a list of list with length of n. x = [[]] * n However, this somehow links the lists together. >>> x = [[]] * 3 >>> x[1].append(0) >>> x [[0], [0], [0]] I expect to have something like: [[], [0], []] Any ideas? Answers: Thank you for visiting the Q&A … Read more
Replace console output in Python
I’m wondering how I could create one of those nifty console counters in Python as in certain C/C++-programs.
How to pivot a dataframe in Pandas?
I have a table in csv format that looks like this. I would like to transpose the table so that the values in the indicator name column are the new columns, Indicator Country Year Value 1 Angola 2005 6 2 Angola 2005 13 3 Angola 2005 10 4 Angola 2005 11 5 Angola 2005 5 … Read more
Single vs double quotes in JSON
My code: