드롭 나 판다 방법

코드 예제

5
0

떨어지는 할머니에서 팬더 데이터 프레임

df.dropna(subset=['name', 'born'])
3
0

판다 드롭 나

df = pd.DataFrame({"name": ['Alfred', 'Batman', 'Catwoman'],
...                    "toy": [np.nan, 'Batmobile', 'Bullwhip'],
...                    "born": [pd.NaT, pd.Timestamp("1940-04-25"),
...                             pd.NaT]})
>>> df
       name        toy       born
0    Alfred        NaN        NaT
1    Batman  Batmobile 1940-04-25
2  Catwoman   Bullwhip        NaT

##Drop the rows where at least one element is missing.
>>> df.dropna()
     name        toy       born
1  Batman  Batmobile 1940-04-25
2
0

드롭 나 판다

>>> df.dropna(axis='columns')
       name
0    Alfred
1    Batman
2  Catwoman
0
0

dropna 임계 값

#dropping columns having more than 50% missing values(1994/2==1000)
df=df.dropna(thresh=1000,axis=1)

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