使用以下cmd：
conda create -n py27 python=2.7
为了将python3改为python 2.7
然后我运行了代码
from sklearn.feature_extraction import DictVectorizer
import csv
from sklearn import tree
from sklearn import preprocessing
from sklearn.externals.six import StringIO
# Read in the csv file and put features into list of dict and list of class label
allElectronicsData = open(r'D:\mycodes\test01\AllElectronics.csv', 'rb')
reader = csv.reader(allElectronicsData)
headers = reader.next()
错误：
Finding files... done.
Importing test modules ... Traceback (most recent call last):
File "D:\huanjing\eclipse-java-neon-R-win32- x86_64\eclipse\plugins\org.python.pydev_5.7.0.201704111357\pysrc\_pydev_runfi les\pydev_runfiles.py", line 468, in __get_module_from_str
mod = __import__(modname)
File "D:\mycodes\test01\tree.py", line 1, in <module>
from sklearn.feature_extraction import DictVectorizer
ImportError: No module named sklearn.feature_extraction
ERROR: Module: tree could not be imported (file: D:/mycodes/test01/tree.py).
done.
Ran 0 tests in 0.000s
看起来我改变了python版本后，我需要再次在conda中安装所有的python包吗？
答案 0 :(得分：0)
是的Python 2.7和Python 3将使用不同的包。在conda环境中运行以下命令：
$ conda install numpy
$ conda install scipy
$ conda install scikit-learn