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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 make_attrstring(attr):
 """Returns an attribute string in the form key="val" """

    attrstring = ' '.join(['%s="%s"' % (k, v) for k, v in attr.items()])
    return '%s%s' % (' ' if attrstring != '' else '', attrstring)