SED command use for writing back to the same file - unix

Question

I have the below code which adds Logger.info line after every function definition which I need to run on a python script which is the requirement.
The only question is this has to be written back to the same file so the new file has all these looger.info statements below each function definition.
e.g. the file abc.py has currently below code :
def run_func(sql_query):
return run_func(sql_query)
and the code below should create the same abc.py file but with all the logger.info added to this new file
def run_func(sql_query):
LOGGER.info (''MIPY_INVOKING run_func function for abc file in directory'
return run_func(sql_query)
I am not able to write the sed in this file to the new file (with same file name) so that the original file gets replaced by same file name and so that I have all the logger.info statements in there.
for i in $(find * -name '*.py');
do echo "#############################################" | tee -a auto_logger.log
echo "File Name : $i" | tee -a auto_logger.log
echo "Listing the python files in the current script $i" | tee -a auto_logger.log
for j in $(grep "def " $i | awk '{print $2}' | awk -F"(" '{print $1}');
do
echo "Function name : $j" | tee -a auto_logger.log
echo "Writing the INVOKING statements for $j function definition" | tee -a auto_logger.log
grep "def " $i |sed '/):/w a LOGGER.info (''INVOKING1 '"$j"' function for '"$i"' file in sam_utilities'')'
if [ $? -ne 0 ] ; then
echo " Auto Logger for $i filename - Not Executed Successfully" | tee -a auto_logger.log
else
echo "Auto Logger for $i filename - Executed Successfully" | tee -a auto_logger.log
fi
done
done