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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 readme():
 """Try converting the README to an RST document. Return it as is on failure."""

    try:
        import pypandoc
        readme_content = pypandoc.convert('README.md', 'rst')
    except(IOError, ImportError):
        print("Warning: no pypandoc module found.")
        try:
            readme_content = open('README.md').read()
        except IOError:
            readme_content = ''
    return readme_content