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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 to_utf8(x):
 """ Tries to utf-8 encode x when possible If x is a string returns it encoded, otherwise tries to iter x and encode utf-8 all strings it contains, returning a list. """

    if isinstance(x, basestring): 
        return x.encode('utf-8') if isinstance(x, unicode) else x
    try:
        l = iter(x)
    except TypeError:
        return x
    return [to_utf8(i) for i in l]