How to use 'show image in jupyter notebook' in Python

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def show_notebook(fname):
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    """display a short summary of the cells of a notebook"""
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    with io.open(fname, 'r', encoding='utf-8') as f:
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        nb = nbformat.read(f, 4)
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    html = []
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    for cell in nb.cells:
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        html.append("<h4>{0} cell</h4>".format(cell.cell_type))
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        if cell.cell_type == 'code':
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            html.append(highlight(cell.source, lexer, formatter))
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        else:
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            html.append("<pre>{0}</pre>".format(cell.source))
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    display(HTML('\n'.join(html)))

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@contextmanager
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def show(self, what):
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    self.begin(what)
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    yield
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    self.end()