python - 导入库的正确方法是什么？

Question

导入时出现错误sklearn。我都试过了

from sklearn.preprocessing import Imputer

和

import impute.SimpleImputer from sklearn

但两者都不起作用。这是我看到的语法错误：

import impute.SimpleImputer from sklearn
imputer= Imputer(missing_values='np.nan',strategy='mean',axis=0)
imputer=imputer.fit(X[:,1:3])
X[:,1:3]=imputer.transform(X[:,1:3])
  File "<ipython-input-47-f72dbfc2a636>", line 1
    import impute.SimpleImputer from sklearn
                                   ^
SyntaxError: invalid syntax 

标签： pythonpython-3.xmachine-learningscikit-learn

Answer 1

from sklearn.impute import SimpleImputer

并像这样使用它：

imputer = SimpleImputer()

这个语法是什么意思：

from sklearn.impute ...

从sklearn具有名为的模块的包中impute

import SimpleImputer

导入类/变量/函数SimpleImputer