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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 get_unicode_from_response(r):
 """Returns the requested content back in unicode. :param r: Response object to get unicode content from. Tried: 1. charset from content-type 2. fall back and replace all unicode characters :rtype: str """

    warnings.warn((
        'In requests 3.0, get_unicode_from_response will be removed. For '
        'more information, please see the discussion on issue #2266. (This'
        ' warning should only appear once.)'),
        DeprecationWarning)

    tried_encodings = []

    # Try charset from content-type
    encoding = get_encoding_from_headers(r.headers)

    if encoding:
        try:
            return str(r.content, encoding)
        except UnicodeError:
            tried_encodings.append(encoding)

    # Fall back:
    try:
        return str(r.content, encoding, errors='replace')
    except TypeError:
        return r.content