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trimpy () {
    python3 -c 'import sys
for line in sys.stdin: print(line.strip())'
}
trimsed () {
gsed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//'
}
# example usage
echo " hi " | trimpy

Bonus: replace str.strip([chars]) with arbitrary characters to trim or use .lstrip() or .rstrip() as needed.

(This is just a remix of other answers here.)