This method simple but important. Example in your project dir is like this:project_dir/
__init__.py
__init__.pyc
something.py
something.pyc
...
core/
__init__.py
__init__.pyc
build.py
build.pyc
Deleting the .pyc files one by one would be spending a lot of time. and you will be bored. There is sample how to handle it.
$ find your_dir -name *.pyc -delete
OR, if you work inside current directory.
$ find . -name *.pyc -delete