【7.1】python3 raise ImportError(This package should not be accessible on Python 3)

当电脑上安装了Python2 和 python3时,在python3下执行help()报如下错误:

raise ImportError('This package should not be accessible on Python 3. '
ImportError: This package should not be accessible on Python 3. 
Either you are trying to run from the python-future src folder or your installation of python-future is corrupted

这是因为环境变量中包含PYTHONPATH=/usr/local/lib/python2.7/site-packages,而这条不适用于python3。 在shell下执行

解决办法:

unset PYTHONPATH
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