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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def check_ocrmypdf(input_file, output_file, *args, env=None):
    "Run ocrmypdf and confirmed that a valid file was created"

    p, out, err = run_ocrmypdf(input_file, output_file, *args, env=env)
    if p.returncode != 0:
        print('stdout\n======')
        print(out)
        print('stderr\n======')
        print(err)
    #assert p.returncode == 0
    #assert os.path.exists(output_file), "Output file not created"
    #assert os.stat(output_file).st_size > 100, "PDF too small or empty"
    return output_file