Elementary OS derived from Ubuntu
$ sudo apt-get install python3-pip ... $ pip3 install textblob
gotta do the trick. You may need to apply some minor variations to the above because of the possible differences between Elementary and Ubuntu.
Remember that Python 2.7 and Python 3.x are two independent systems, what you install in 2.7 is definitely NOT automatically available for 3.x, and the converse is equally true.
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