[Solved] TypeError: can’t multiply sequence by non-int of type ‘unicode’

by

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You should cast your variable to type int :

@api.onchange('length','width')
def _compute_size_id(self):
    for s in self:
        if (s.length and s.width):
            s.size_wise = int(s.length )* int(s.width)

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solved TypeError: can’t multiply sequence by non-int of type ‘unicode’