Python

How to split a dataframe string column into two columns?

I have a data frame with one (string) column and I’d like to split it into two (string) columns, with one column header as ‘fips’ and the other ‘row’ My dataframe df looks like this: I do not know how to use df.row.str[:] to achieve my goal of splitting the row cell. I can use df…

How can I remove the ANSI escape sequences from a string in python

ansi-escape escaping python string

Here is a snippet that includes my string. The string was returned from an SSH command that I executed. I can’t use the string in its current state because it contains ANSI standardized escape sequences. How can I programmatically remove the escape sequences so that the only part of the string remaining…

Create a 2D list out of 1D list

matrix python

I am a bit new to Python and I want to convert a 1D list to a 2D list, given the width and length of this matrix. Say I have a list=[0,1,2,3] and I want to make a 2 by 2 matrix of this list. How can I get matrix [[0,1],[2,3]] width=2, length=2 out of the list? Answer Try something

python pandas extract unique dates from time series

dataframe datetime pandas python time-series

I have a DataFrame which contains a lot of intraday data, the DataFrame has several days of data, dates are not continuous. How can I extract the unique date in the datetime format from the above DataFrame? To have result like [2012-10-08, 2012-10-10] Answer If you have a Series like: where each object is a T…

How to drop a list of rows from Pandas dataframe?

pandas python

I have a dataframe df : Then I want to drop rows with certain sequence numbers which indicated in a list, suppose here is [1,2,4], then left: How or what function can do that ? Answer Use DataFrame.drop and pass it a Series of index labels:

OpenCV v1/v2 error: the function is not implemented

opencv python

I’m trying to get OpenCV working with Python on my Ubuntu machine. I’ve downloaded and installed OpenCV, but when I attempt to run the following python code (which should capture images from a webcam and push them to the screen) I get the following error: So I do what they ask: install the package…

Merge of lazy streams (using generators) in Python

functional-programming generator hamming-numbers primes python

I’m playing with functional capacities of Python 3 and I tried to implement classical algorithm for calculating Hamming numbers. That’s the numbers which have as prime factors only 2, 3 or 5. First Hamming numbers are 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 18, 20 and so on. My implementation is the fol…

Breakpoint-induced interactive debugging of Python with IPython

breakpoints debugging ipdb ipython python

Say I have an IPython session, from which I call some script: Is there a way to induce a breakpoint in my_script.py from which I can inspect my workspace from IPython? I remember reading that in previous versions of IPython one could do: but the submodule Debugger does not seem to be available anymore. Assumi…

Python inserting variable string as file name

file python python-2.7

I’m trying to create a file with a unique file name for every time my script runs. I am only intending to do this to every week or month. so I chose to use the date for the file name. is where I’m getting this error. it works if I use a static filename, is there an issue with the