PYTHON : What causes the '' in ['h', 'e', 'l', 'l', 'o', ''] when you do re.findall('[\w]?', 'hello'

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PYTHON : What causes the '' in ['h', 'e', 'l', 'l', 'o', ''] when you do re.findall('[\w]?', 'hello')
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PYTHON : What causes the '' in ['h', 'e', 'l', 'l', 'o', ''] when you do re.findall('[\w]?', 'hello')
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