How do I using with open() as f: … to write the file in a directory that doesn’t exist. For example: Let’s say the /Users/bill/output/ directory doesn’t exist. If the directory doesn’t exist just create the directory and write the file there. Answer You need to first create the d…
Tag: python
Postgresql Database Backup Using Python
I would like to backup database using Python code. I want to backup some tables of related data. How to backup and how to choose desired tables using “SELECT” statement? e.g. I want to get data from 2014-05-01 to 2014-05-10 of some tables and output this result as .sql extension file How can I get…
How to draw a rectangle around a region of interest in python
I’m having trouble with import cv in my python code. My issue is I need to draw a rectangle around regions of interest in an image. How can this be done in python? I’m doing object detection and would like to draw a rectangle around the objects I believe I’ve found in the image. Answer pleas…
pandas apply function that returns multiple values to rows in pandas dataframe
I have a dataframe with a timeindex and 3 columns containing the coordinates of a 3D vector: I would like to apply a transformation to each row that also returns a vector but if I do: I end up with a Pandas series whose elements are tuples. This is beacause apply will take the result of myfunc without unpacki…
Printing a file and configure printer settings
I’m trying to code a printer automation using Python on Windows, but can’t get it done. I’m not really understanding the topic and i’m a little surprised – a “simple” way to get this done doesn’t seem to exist..? There are so many APIs that allow to access commo…
How to strip a specific word from a string?
I need to strip a specific word from a string. But I find python strip method seems can’t recognize an ordered word. The just strip off any characters passed to the parameter. For example: How could I strip a specified word with python? Answer Use str.replace. Alternatively use re and use regular expres…
How to take Screenshot in Mac OS X from inside of Python: aka Command-Control-Shift-4
With Command-Control-Shift-4 the screenshot area can be taken/then saved to a clipboard. I wonder if same would be possible from inside of Python. Ideally an image file format could be specified as well as to where to save it all programmatically within Python. Any ideas? edited later 1 I’ve located app…
Python in emacs: __name__ == ‘__main__’, but somehow not
I am coding python in emacs. However, somehow the python interpreter running in emacs manages to surprise me. If I write in an emacs buffer, and tell emacs to start an interpreter and run the content of this buffer, I get a buffer containing (Both __main__ and True are the outputs from the print statement; th…
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…
What Does This Output Represent?
I’m trying to get my RPi to send temp data to Xively and I’m having a horrible time getting my code to work. This is the latest reponse I get when I run the python script… Can someone explain to me what this means and what I need to do to correct? Thanks. Answer The xively module is expectin…