ImportError: cannot import name 'mutual_info_classif' - scikit-learn

I want to do feature selection using K-Best and scoring function 'mutual_info_classif' in scikitlearn. However I am not able to import this function because of this error:
ImportError: cannot import name 'mutual_info_classif'

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ImportError: cannot import name 'RandomizedLasso' from 'sklearn.linear_model'

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NameError: name 'os_PathLike' is not defined

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But I am getting an error as follows:
File "/Users/vivekchowdary/opt/anaconda3/lib/python3.7/site-packages/numpy/lib/npyio.py", line 965, in loadtxt
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Pandas ImportError

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python3.5 : No module named 'twisted.enterprise'

I am using python3.5.2,there is a sentence in demo.py,as follow:
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There is an error when running:
from twisted.enterprise import adbapi
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What should I do?

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