In [17]: def successor(n):
....: return n + 1
....:
In [18]: successor([1,2])
-------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-19-1765bbb8b6cb> in <module>()
----> 1 successor([1,2])
<ipython-input-17-309f704229ee> in successor(n)
1 def successor(n):
----> 2 return n + 1
3
TypeError: can only concatenate list (not "int") to list
In [19]: %debug
> <ipython-input-17-309f704229ee>(2)successor()
1 def successor(n):
----> 2 return n + 1
3
ipdb> p n
[1, 2]