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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 apply_patch(diffs):
 """ Not ready for use yet """

    pass

    if isinstance(diffs, patch.diff):
        diffs = [diffs]

    for diff in diffs:
        if diff.header.old_path == '/dev/null':
            text = []
        else:
            with open(diff.header.old_path) as f:
                text = f.read()

        new_text = apply_diff(diff, text)
        with open(diff.header.new_path, 'w') as f:
            f.write(new_text)