Overview

Pandas 1.4, released on January 23, 2022, adds multi-column apply and improves the Styler system for DataFrame formatting.

Main Features

Multi-column apply

The apply method now supports functions returning multiple columns more intuitively with result_type='expand'.

python 
import pandas as pd

df = pd.DataFrame({'text': ['hello world', 'foo bar baz']})

# Apply returning multiple columns
result = df['text'].str.split(' ', expand=True)
result.columns = ['word1', 'word2', 'word3']
print(result)
#    word1  word2  word3
# 0  hello  world   None
# 1    foo    bar    baz

Improved Styler

The Styler now supports new options such as tooltips, improved HTML export, and style concatenation.

python 
import pandas as pd

df = pd.DataFrame({
    'A': [1, 2, 3],
    'B': [4, 5, 6],
})

styled = (
    df.style
    .highlight_max(color='lightgreen')
    .highlight_min(color='lightcoral')
    .set_caption('Styler 1.4 example')
)
# styled.to_html()

Sources