I have a large dataframe (DF1) that contains a variable containing UK postcode data. Inevitably there are some typos in the data. However, after some work with regular expressions, I have created a second database that contains corrected versions of the postcode data (but only for those rows where the origina…
Tag: python
Retrieve length of slice from slice object in Python
The title explains itself, how to get 2 out of the object The documentation is somewhat confusing, or it is the wrong one https://docs.python.org/2/c-api/slice.html In particular I don’t understand what is the meaning of the output of One possible workaround is to slice a list with the slice object But …
Using NearestNeighbors and word2vec to detect sentence similarity
I have calculated a word2vec model using python and gensim in my corpus. Then I calculated the mean word2vec vector for each sentence (averaging all the vectors for all the words in the sentence) and stored it in a pandas data frame. The columns of the pandas data frame df are: sentence Book title (the book w…
What’s difference between tf.sub and just minus operation in tensorflow?
I am trying to use Tensorflow. Here is an very simple code. Just ignore the optimization part (4th line). It will take a floating number and train W1 so as to increase squared difference. My question is simple. If I use just minus sign instead of tf.sub” as below, what is different? Will it cause a wron…
How can I limit iterations of a loop?
Say I have a list of items, and I want to iterate over the first few of it: Naive implementation The Python naïf coming from other languages would probably write this perfectly serviceable and performant (if unidiomatic) code: More idiomatic implementation But Python has enumerate, which subsumes about half o…
python xlsxwriter change row height for all rows in the sheet
Python xlsxwriter, change row height for all rows in the sheet, following is available but apply to single row Want to change height of all the rows sheet. Answer To set the height of all rows in XlsxWriter, efficiently*, you can use the set_default_row() method: (*) This is efficient because it uses an Excel…
Running a python script in virtual environment with node.js pm2
I would like to reference this question because I am certain that someone will flag this as a duplicate. I am not looking for another reference to supervisord. I’m sure that it is great and all, but the node PM2 has the functionality that I require and is more straightforward to implement and test. Manu…
Pandas row to json
I have a dataframe in pandas and my goal is to write each row of the dataframe as a new json file. I’m a bit stuck right now. My intuition was to iterate over the rows of the dataframe (using df.iterrows) and use json.dumps to dump the file but to no avail. Any thoughts? Answer Pandas DataFrames have a …
Contourf on the faces of a Matplotlib cube
I am trying to ‘paint’ the faces of a cube with a contourf function using Python Matplotlib. Is this possible? This is similar idea to what was done here but obviously I cannot use patches. Similarly, I don’t think I can use add_collection3d like this as it only supports PolyCollection, Line…
How to plot multiple linear regressions in the same figure
Given the following: This will create 2 separate plots. How can I add the data from df2 onto the SAME graph? All the seaborn examples I have found online seem to focus on how you can create adjacent graphs (say, via the ‘hue’ and ‘col_wrap’ options). Also, I prefer not to use the datas…