[Python] How to define a Bash variable from Python EOF

I'm relatively new to Bash and unable to explain my problem in the title. I've done a lot of googling and I guess that's the title I came up with.

I want to be able to use Python EOF and define a Bash variable in the EOF (if possible) and call it after.

File test.txt


everything - literally the string everything


And I'm opening this file and getting contents with

File test.sh


#!/bin/bash
CMD=$(cat <<EOF

with open('text.txt', 'r') as f:
for line in f.readlines():
pass

print(f"WOW text has {line}")

EOF
)

python3 -c "$CMD"


Output:

WOW text has everything


I want to be able to share a variable by defining it in my CMD (I don't know what it's called) and echo it in Bash after it's done;

#!/bin/bash
CMD=$(cat <<EOF

with open('text.txt', 'r') as f:
for line in f.readlines():
pass

print(f"WOW text has {line}")
$var = line - somehow define a Bash variable in Python EOF
EOF
)

python3 -c "$CMD"
echo $var - output this


So then the new output (of what I want) is:

WOW text has everything
everything

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