Call Functions on Pandas DataFrames Values
Let's find out how a pandas DataFrames works along with Python functions.
We'll cover the following...
Try it yourself
Try executing the code below to see the result.
import pandas as pd
cities = pd.DataFrame([
('Vienna', 'Austria', 1_899_055),
('Sofia', 'Bulgaria', 1_238_438),
('Tekirdağ', 'Turkey', 1_055_412),
], columns=['City', 'Country', 'Population'])
def population_of(city):
return cities[cities['City'] == city]['Population']
city = 'Tekirdağ'
print(population_of(city))How to retrieve specific data from a DataFrame
Explanation
The output is telling us that Tekirdağ couldn’t be found in the cities DataFrame. But, it’s
clearly there!
Let’s investigate the code below:
In [1]: city
Out[1]: 'Tekirdağ'
In [2]: city2 = cities.loc[2]['City']
In [3]: city2
Out[3]: 'Tekirdağ'
In [4]: city2 == city
Out[4]: False
In [5]: len(city)
Out[5]: 9
In [6]: len(city2)
Out[6]: 8
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