[sage-support] How do I use @interact with sage 8.0 jupyter notebook?

[Andy Howell]

I'm trying to learn how to use the @interact command.

The examples 
here: http://doc.sagemath.org/html/en/prep/Quickstarts/Interact.html do not 
work. I get a stack traces complaining about variable types etc.

Other examples I tried:

https://wiki.sagemath.org/interact/calculus#Some_polar_parametric_curves

With that I get:

𝙸𝚗𝚝𝚎𝚛𝚊𝚌𝚝𝚒𝚟𝚎𝚏𝚞𝚗𝚌𝚝𝚒𝚘𝚗<𝚏𝚞𝚗𝚌𝚝𝚒𝚘𝚗𝚙𝚊𝚛𝚊𝚊𝚝𝟶𝚡𝟽𝚏𝚊𝚋𝟹𝟼𝚎𝟶𝟾𝚌𝚏𝟾>𝚠𝚒𝚝𝚑𝟻𝚠𝚒𝚍𝚐𝚎𝚝𝚜𝚗𝟷:𝙴𝚟𝚊𝚕𝚃𝚎𝚡𝚝(𝚟𝚊𝚕𝚞𝚎=𝚞'𝚂𝚕𝚒𝚍𝚎𝚛:𝙽𝚘𝚗𝚎[𝟷⎯⎯|𝟸|⎯⎯⎯𝟻]',𝚍𝚎𝚜𝚌𝚛𝚒𝚙𝚝𝚒𝚘𝚗=𝚞'𝚗𝟷')𝚗𝟸:𝙴𝚟𝚊𝚕𝚃𝚎𝚡𝚝(𝚟𝚊𝚕𝚞𝚎=𝚞'𝚂𝚕𝚒𝚍𝚎𝚛:𝙽𝚘𝚗𝚎[𝟷⎯⎯|𝟹|⎯⎯⎯𝟻]',𝚍𝚎𝚜𝚌𝚛𝚒𝚙𝚝𝚒𝚘𝚗=𝚞'𝚗𝟸')𝚊𝟷:𝙴𝚟𝚊𝚕𝚃𝚎𝚡𝚝(𝚟𝚊𝚕𝚞𝚎=𝚞'𝚂𝚕𝚒𝚍𝚎𝚛:𝙽𝚘𝚗𝚎[𝟷⎯⎯|𝟼/𝟻|⎯⎯⎯𝟷𝟶]',𝚍𝚎𝚜𝚌𝚛𝚒𝚙𝚝𝚒𝚘𝚗=𝚞'𝚊𝟷')𝚊𝟸:𝙴𝚟𝚊𝚕𝚃𝚎𝚡𝚝(𝚟𝚊𝚕𝚞𝚎=𝚞'𝚂𝚕𝚒𝚍𝚎𝚛:𝙽𝚘𝚗𝚎[𝟷⎯⎯|𝟼|⎯⎯⎯𝟷𝟶]',𝚍𝚎𝚜𝚌𝚛𝚒𝚙𝚝𝚒𝚘𝚗=𝚞'𝚊𝟸')𝚋:𝙴𝚟𝚊𝚕𝚃𝚎𝚡𝚝(𝚟𝚊𝚕𝚞𝚎=𝚞'𝚂𝚕𝚒𝚍𝚎𝚛:𝙽𝚘𝚗𝚎[𝟶⎯⎯|𝟶|⎯⎯⎯𝟸]',𝚍𝚎𝚜𝚌𝚛𝚒𝚙𝚝𝚒𝚘𝚗=𝚞'𝚋')

TypeError                                 Traceback (most recent call last)
<ipython-input-105-fc4092c2f8fe> in <module>()
      6     show(p, figsize = [Integer(5),Integer(5)], xmin = 
-Integer(2)-b, xmax = Integer(2)+b, ymin = -Integer(2)-b, ymax = 
Integer(2)+b, axes = False)
      7 
----> 8 para()

<ipython-input-105-fc4092c2f8fe> in para(n1, n2, a1, a2, b)
      2 def para(n1 = slider(Integer(1),Integer(5),Integer(1),default = 
Integer(2)), n2 = slider(Integer(1),Integer(5),Integer(1),default = 
Integer(3)), a1 = 
slider(Integer(1),Integer(10),Integer(1)/Integer(10),Integer(6)/Integer(5)), 
a2 = slider(Integer(1),Integer(10),Integer(1)/Integer(10),Integer(6)), b = 
slider(Integer(0),Integer(2),Integer(1)/Integer(50),Integer(0))):
      3     var('t')
----> 4     pretty_print(html('$r=' + latex(b+sin(a1*t)**n1 + 
cos(a2*t)**n2)+'$'))
      5     p = parametric_plot((cos(t)*(b+sin(a1*t)**n1 + cos(a2*t)**n2), 
sin(t)*(b+sin(a1*t)**n1 + cos(a2*t)**n2)), (t,Integer(0), Integer(20)*pi), 
plot_points = Integer(1024), rgbcolor = (Integer(0),Integer(0),Integer(0)))
      6     show(p, figsize = [Integer(5),Integer(5)], xmin = 
-Integer(2)-b, xmax = Integer(2)+b, ymin = -Integer(2)-b, ymax = 
Integer(2)+b, axes = False)

TypeError: unsupported operand type(s) for *: 'instance' and 
'sage.symbolic.expression.Expression'

Any hints on how to make this work?

Thanks,

Andy

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