Ben Chuanlong Du's Blog

It is never too late to learn.

Cast Types of Columns in Pandas

Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

Tips and Traps

  1. You can use the method Series.astype to cast the type of a series.

  2. Series.astype(str) converts NaNs to the string literal nan. This is often NOT what people want. A better way is to use Series.astype(object)

Tips on ValeLang

Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

My first impression is that Vale is Rust with GC. It looks interesting. However, consider that it is an language which came ealier than Rust but still in alpha stage, I …

Profiling Data Using ydata-profiling

Tips and Traps

  1. It is suggested that you use multiprocessing (e.g., pool_size=8) to speed up data profiling. Note: It seems to me that currently multiprocessing only works when minimal=True.

  2. minimal=True helps reuce consumed memory.

     profile = ProfileReport(
     df, title="Data Profiling Report", 
     explorative=True, minimal=True, pool_size=8
 )

Loop in Golang

Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

Check Whether a Path Exists in Golang

Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

Tips & Traps

There is no built-in function to check for the existence of a path in Golang. However, you can achieve it using os.Stat + os.IsNotExist.