Help with python code to search string in one file & replace with line in other file

[mforthman]

Seems to lead me to different issue now regarding pathlib. Was getting

ImportError: No module named pathlib

Then I tried using pip to install pathlib and got:

pip install pathlib
Collecting pathlib
Downloading pathlib-1.0.1.tar.gz (49kB)
100% |████████████████████████████████| 51kB 1.2MB/s
Installing collected packages: pathlib
Running setup.py install for pathlib ... error
Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/private/var/folders/tc/s83_bztx34783jsqlt75bb6r0000gn/T/pip-build-F8mpfz/pathlib/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /var/folders/tc/s83_bztx34783jsqlt75bb6r0000gn/T/pip-BNm0zc-record/install-record.txt --single-version-externally-managed --compile:
running install
running build
running build_py
creating build
creating build/lib
copying pathlib.py -> build/lib
running install_lib
copying build/lib/pathlib.py -> /Library/Python/2.7/site-packages
error: [Errno 13] Permission denied: '/Library/Python/2.7/site-packages/pathlib.py'

----------------------------------------
Command "/usr/bin/python -u -c "import setuptools, tokenize;__file__='/private/var/folders/tc/s83_bztx34783jsqlt75bb6r0000gn/T/pip-build-F8mpfz/pathlib/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /var/folders/tc/s83_bztx34783jsqlt75bb6r0000gn/T/pip-BNm0zc-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/tc/s83_bztx34783jsqlt75bb6r0000gn/T/pip-build-F8mpfz/pathlib/

I can't seem to win on this lol