Write the output of a script in a html page using flask

I wrote a script that makes me able to run a script and then to get the output I want, I am trying to write the output in a html page, how can I do that? this is my script:

def execute(cmd):
    os.system(cmd)
    to_return =dict()
    for filename in files:
        with open(filename, 'r') as f:
            data = f.read()
            to_return[filename] = data
    return to_return

output = execute('./script')
print output

Any Idea of how I can generate an html page where I can print the result of running this script??