How to Merge Pandas DataFrames

How to Avoid Losing Valuable Data Points (incl. Cheat Sheet)

One common pitfall when merging two DataFrames is unintentionally losing valuable data points. Sometimes you need to extend your initial dataset with additional information from a second dataset. For this, you can read the two datasets into pandas DataFrames and then combine them with the .merge() method into one DataFrame. However, depending on how you merge them, you can end up with fewer or …

dataframes data science pandas programming python sql