Python code from 'Advanced Future Trading' bugy?

[localempire]

Dear all,
I would like to test chapter27 from “Advanced Future Tranig” and first tried the Python code from the book.
Unfortunately there is a problem in the function from Chapter3 in line 222. instrument_risk_ann_perc=instrument_risk_ann_perc[-1] is unresoled.
Even in Chapter27 there is an unknown 'current_price':

Traceback (most recent call last):
  File "/Users/papa/Downloads/trade/chapter27.py", line 257, in <module>
    average_position_contracts_dict = calculate_position_series_given_variable_risk_for_dict(
TypeError: calculate_position_series_given_variable_risk_for_dict() got an unexpected keyword argument 'current_prices'

Does anyone else have this problem?
Or has someone already "Mean reversion" implemented as a rule?

Thank you very much

[craigmediaservices]

Mr. Carver does have two mean reversion rules implemented:

https://github.com/robcarver17/pysystemtrade/tree/master/systems/provided/rules

mr_wings.py
cs_mr.py

[localempire]

Thanks for the hint.
One of the thoughts I had planned to start with. The formulas are well explained and also work in Excel.
Regards.