Class Modules, and Passing Variables: Seeking Advice

[Gribouillis]

At line 39 you're not calling the close method! Use close(). Note that the read method can be shrunk to

def read(self, file_path):
    with open(file_path, 'r') as stream_reader:
        return [line.strip() for line in stream_reader if line.strip()]

close() is run automatically at the end of the with block. This code also removes blank lines if any.