Stefan

Stefan has asked 5 questions and find answers to 123 problems.

Stats

About

Economist, entrepreneur and data scientist. Author of

Machine Learning for Algorithmic Trading
Hands On Unsupervised Learning
Mastering Unsupervised Learning
Importing and Managing Financial Data in Python
Manipulating Time Series Data in Python

Stefan questions

Python multiprocess with pool workers - memory use optimization
Vectorize haversine distance computation along path given by list of coordinates
Copy text between parentheses in pandas DataFrame column into another column
How to insert pandas dataframe via mysqldb into database?

Stefan answers

How to split DataFrame by column
concatenate multiple rows to one single row in pandas
How to join two or more DataFrames in pandas, python [duplicate]
Creating a new column that combines content of two other columns in a list
How to select rows in a dataframe based on values in three columns?
Pandas: creating a lagged column with grouped data
count of last n days per group
Create Multiindex from pattern in column names
How to apply a randomforest classifier to all of the dataset, a small section at a time in python
How do I merge duplicate rows into one on a DataFrame when they have different values