The data frame first_south is created using first_south = (titanic['Pclass']==1) & (titanic['Embarked']=='S')
To do this, we make the following assumptions:
When pclass column is 1.
This is represented as:
titanic['pclass']==1
When the passenger boards from Southampton.
This is represented as:
titanic['Embarked']=='S'
So, we have:
first_south = (titanic['Pclass']==1) & (titanic['Embarked']=='S')
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