Converting matplotlib png to base64 for viewing in html template

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The beginning of the data in the template gives a clue to what’s happening. ' is the HTML entity for a single quote '. Combined with the preceding b, b', it looks like the representation of a byte string, rather than the contents of the string.

Decode the byte string to a string before trying to render them with Jinja.

render_template('result.html', result=figdata_png.decode('utf8'))

Jinja renders the string representation of objects in {{ }}. The string representation of a byte string includes the b'' to distinguish it from a Unicode string. So you have to decode in order to display their value directly.

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