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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 smart_cloud(self,input,max_text_size=72,min_text_size=12,exclude_words = True):
        '''Creates a word cloud using the input.
           Input can be a file, directory, or text.
           Set exclude_words to true if you want to eliminate words that only occur once.'''
        self.exclude_words = exclude_words
        if isdir(input):
            self.directory_cloud(input,max_text_size,min_text_size)
        elif isfile(input):
            text = read_file(input)
            self.text_cloud(text,max_text_size,min_text_size)
        elif isinstance(input, basestring):
            self.text_cloud(input,max_text_size,min_text_size)
        else:
            print 'Input type not supported.'
            print 'Supported types: String, Directory, .txt file'