2022-02-24

df['x'] == 1  # 결과는 boolean series

df.groupby('x') # 'x'는 index로

 

.isin()(= ==+for) vs ==

households_no_head = df.loc[df['x'].isin(s[s == 0].index), :] # series.value.isin(index)

for i in (s[s == 0].index): 
    households_no_head = df.loc[df['x']==i, :] 

 

df['x'] == np.nan
-> df.loc[df['x'].isnull()]

 

Counter(x) -> dict