Accessing using .loc[] [3/3]

Two chapters ago it was mentioned that boolean array can be used to access rows with the .loc[] property. It means you can filter rows without using if/else statements!

A condition you want to use for filtering must be passed as the first parameter. For example,


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# Importing library
import pandas as pd

# Reading csv file
df = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/67798cef-5e7c-4fbc-af7d-ae96b4443c0a/audi.csv')
# Get the cars manufactured before 2000
print(df.loc[df.year < 2000])

If you want to filter based on several conditions, you need to put them within separate parentheses, and combine them by either the & (and), or | (or) operator. You use the & operator if you need all the conditions to be hold. If you are interested in at least one of the conditions, use the | operator.


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# Importing library
import pandas as pd

# Reading csv file
df = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/67798cef-5e7c-4fbc-af7d-ae96b4443c0a/audi.csv')
# Get the Diesel cars cheaper than 15k
print(df.loc[(df.fuelType == 'Diesel') & (df.price < 15000)])

Tudo estava claro?

Seção 3. Capítulo 8