Python提示AttributeError 或者DeprecationWarning: This module was deprecated解决方法
在使用Python的sklearn库时，发现sklearn的cross_validation不能使用，在pycharm上直接显示为被横线划掉。
运行程序：
import sklearn
...
X, Xt, y, yt = sklearn.cross_validation.train_test_split(X, y)
报错：
AttributeError: 'module' object has no attribute 'cross_validation'
这里尝试修改为：
from sklearn.cross_validation import train_test_split
X, Xt, y, yt = train_test_split(X, y)
发现不再报错，而是提示警告信息：
**DeprecationWarning: This module was deprecated in version 0.18 in favor of the model_selection module into which all the refactored classes and functions are moved. Also note that the interface of the new CV iterators are different from that of this module. This module will be removed in 0.20.
"This module will be removed in 0.20.", DeprecationWarning) **
程序能够正常执行。
但是注意看提示信息，实际上是说cross_validation模块被弃用了，改为支持model_selection这个模块，因此，将程序改为：
from sklearn.model_selection import train_test_split
X, Xt, y, yt = train_test_split(X, y)
不再出现警告信息，一切正常。