Book Image

Pandas 1.x Cookbook - Second Edition

By : Matthew Harrison, Theodore Petrou
Book Image

Pandas 1.x Cookbook - Second Edition

By: Matthew Harrison, Theodore Petrou

Overview of this book

The pandas library is massive, and it's common for frequent users to be unaware of many of its more impressive features. The official pandas documentation, while thorough, does not contain many useful examples of how to piece together multiple commands as one would do during an actual analysis. This book guides you, as if you were looking over the shoulder of an expert, through situations that you are highly likely to encounter. This new updated and revised edition provides you with unique, idiomatic, and fun recipes for both fundamental and advanced data manipulation tasks with pandas. Some recipes focus on achieving a deeper understanding of basic principles, or comparing and contrasting two similar operations. Other recipes will dive deep into a particular dataset, uncovering new and unexpected insights along the way. Many advanced recipes combine several different features across the pandas library to generate results.
Table of Contents (17 chapters)
15
Other Books You May Enjoy
16
Index

Selecting DataFrame rows

The most explicit and preferred way to select DataFrame rows is with .iloc and .loc. They are both capable of selecting by rows or by rows and columns.

This recipe shows you how to select rows from a DataFrame using the .iloc and .loc indexers:

  1. Read in the college dataset, and set the index as the institution name:
    >>> college = pd.read_csv(
    ...     "data/college.csv", index_col="INSTNM"
    ... )
    >>> college.sample(5, random_state=42)
                         CITY STABBR  ...  MD_EARN_WNE_P10  GRAD_DEBT_MDN_SUPP
    INSTNM                            ...
    Career Po...  San Antonio     TX  ...        20700            14977
    Ner Israe...    Baltimore     MD  ...  PrivacyS...      PrivacyS...
    Reflectio...      Decatur     IL  ...          NaN      PrivacyS...
    Capital A...  Baton Rouge     LA  ...        26400      PrivacyS...
    West Virg...   Montgomery     WV  ...        43400            23969
    <BLANKLINE&gt...