之间的差异。 venv / bin / activate和./venv/bin/activate

Question

all

I have a question about an format that to run shell script I encounter this problem is that I setup a virtual environment

But when I type

. venv/bin/activate

The code has no problem and run it successfully.But I know the other way to run it using

 ./venv/bin/activate

the bash prompt an error saying I don't have permission to do that.

I don't know what's the difference between them, any help would be appreciate

Answer 1

The activate script created by virtualenv isn't actually a standard script for executing anything, but it's something that defines further environment variables to an existing bash session. Note the comment in that file:

# This file must be used with "source bin/activate" *from bash*
# you cannot run it directly

The . venv/bin/activate . venv/bin/activate is actually a synonym to source venv/bin/activate . In essence, what virtualenv does is to execute a number of statements in the current shell (sourcing the contents of the file into here), rather than starting a new shell process as if you would execute a binary (ie ./venv/bin/python ).