https://github.com/DjangoGirls/resources/blob/master/cheatsheets/cheat-sheet.pdf recommends:

source myvenv/bin/activate
or myvenv/bin/activate

But the second option doesn't work with venv or virtualenv created environments:

~ $ myvenv/bin/activate bash: myvenv/bin/activate: Permission denied 

If you cat the script, it notes that "you cannot run it directly" in the comment at the top:

• https://github.com/python/cpython/blob/main/Lib/venv/scripts/common/activate#L2
• https://github.com/pypa/virtualenv/blob/main/src/virtualenv/activation/bash/activate.sh#L2