How do I build a numpy array from a generator?
How can I build a numpy array out of a generator object?
python
matplotlib colorbar for scatter
I’m working with data that has the data has 3 plotting parameters: x,y,c. How do you create a custom color value for a scatter plot?
Faster way to read Excel files to pandas dataframe
I have a 14MB Excel file with five worksheets that I’m reading into a Pandas dataframe, and although the code below works, it takes 9 minutes!
Parameterized queries with psycopg2 / Python DB-API and PostgreSQL
What’s the best way to make psycopg2 pass parameterized queries to PostgreSQL? I don’t want to write my own escpaing mechanisms or adapters and the psycopg2 source code and examples are difficult to read in a web browser.
Variable assignment and modification (in python)
When I ran this script (Python v2.6): a = [1,2] b = a a.append(3) print a >>>> [1,2,3] print b >>>> [1,2,3] I expected print b to output [1,2]. Why did b get changed when all I did was change a? Is b permanently tied to a? If so, can I make them independent? How? … Read more
Draw a transparent rectangles and polygons in pygame
How can I draw a rectangle that has a color with an alpha?
I have:
Matplotlib: Specify format of floats for tick labels
I am trying to set the format to two decimal numbers in a matplotlib subplot environment. Unfortunately, I do not have any idea how to solve this task.
Django: Deploying an application on Heroku with sqlite3 as the database
I want to deploy an application with sqlite3 as the database on Heroku. However, it seems to be that Heroku doesn’t support applications with sqlite3 as the database. Is it true? Is there no way to deploy my sqlite3-backed application on Heroku?
How do I convert a currency string to a floating point number in Python?
I have some strings representing numbers with specific currency format, for example: