How to filter a DataFrame using one conditional statement

You can filter a DataFrame by applying a mask.

Here is how

We define a sample DataFrame

import pandas as pd

# We read a sample dataset from the web.
df = pd.read_csv('https://raw.githubusercontent.com/mwaskom/seaborn-data/master/iris.csv')

One conditional statement mask

A condition within squared brackets

# The mask
mask = df["sepal_length"] > .4

# We apply the mask
print(df[mask])

it is also possible to it in one-line

print(df[df["sepal_length"] > .4])

You might also be interested in how to apply multiple conditional statements.