Indexing, Selecting & Assigning PDpy

Column first

Default

Pouze jeden column

1. reviews.country
2. reviews['country'] Pouze jeden prvek reviews['country'][0]

Row first

loc, iloc

iloc

reviews.iloc[0] první řádek

reviews.iloc[:, 0] == reviews['country']
// True

loc

df.loc['Anna'] vrací podle indexu

Manipulování indexu

reviews.set_index("title")

Podmíněný výběr

reviews.country == 'Italy'
 
0          True
1         False
          ...  
129969    False
129970    False
Name: country, Length: 129971, dtype: bool
 
 
reviews.loc[(reviews.country == 'Italy') | (reviews.points >= 90)]
// A zároveň &
 
 
 
reviews.loc[reviews.country.isin(['Italy', 'France'])]
 
reviews.loc[reviews.price.notnull()]

Přiřazení data

reviews['critic'] = 'everyone'
reviews['critic']
 
0         everyone
1         everyone
            ...   
129969    everyone
129970    everyone
Name: critic, Length: 129971, dtype: object