为什么print nltk.ConditionalFreqDist表格的输出中没有？

Question

使用Anaconda Spyder、Python 3.8.3、nltk 3.5。代码和输出如下所示：

from nltk.corpus import reuters
cfd = [('gas', word) for word in brown.words(categories='gas')]
print(cfd.tabulate(conditions=['gas'], samples=['gasoline', 'barrels']))

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Output:
    gasoline  barrels 
gas       77       64 
None

如何才能从此输出中删除任何内容？

FYI - None is not in output when I use Jupyter notebook as below:

cfd = [('gas', word) for word in brown.words(categories='gas')]
cfd.tabulate(conditions=['gas'], samples=['gasoline', 'barrels']

----------------
Output:
    gasoline  barrels 
gas       77       64

Answer 1

您不需要打印来显示输出。只用

cfd.tabulate(conditions=['gas'], samples=['gasoline', 'barrels'])