calc: _Result doesn't like dividing anymore

[Narrat]

File "eispice3/module/calc.py", line 79, in calc.Variable
Failed example:
z = xx + cos(20*y + x) - (x / (y+50)) # z is of type _Result
Exception raised:
Traceback (most recent call last):
File "/usr/lib/python3.4/doctest.py", line 1324, in __run
compileflags, 1), test.globs)
File "<doctest calc.Variable[3]>", line 1, in
z = xx + cos(20*y + x) - (x / (y+50)) # z is of type _Result
TypeError: unsupported operand type(s) for /: 'Variable' and '_Result'

[Narrat]

Didn't check what _Result and Variable is yet, but one candidate could be PEP238
https://www.python.org/dev/peps/pep-0238/

[Narrat]

In that case all of calc needs to be checked if is one thing defined there that should be // now

[Narrat]

Or somewhere is a cast missing