# Buggy code
def deploy_new_hyperopt(hyperopt_name, hyperopt_path: Path, subtemplate: str):
    """
    Deploys a new hyperopt template to hyperopt_path
    """
    buy_guards = render_template(
        templatefile=f"subtemplates/hyperopt_buy_guards_{subtemplate}.j2",
    )
    sell_guards = render_template(
        templatefile=f"subtemplates/hyperopt_sell_guards_{subtemplate}.j2",
    )
    buy_space = render_template(
        templatefile=f"subtemplates/hyperopt_buy_space_{subtemplate}.j2",
    )
    sell_space = render_template(
        templatefile=f"subtemplates/hyperopt_sell_space_{subtemplate}.j2",
    )

    strategy_text = render_template(
        templatefile="base_hyperopt.py.j2",
        arguments={
            "hyperopt": hyperopt_name,
            "buy_guards": buy_guards,
            "sell_guards": sell_guards,
            "buy_space": buy_space,
            "sell_space": sell_space,
        },
    )

    logger.info(f"Writing hyperopt to `{hyperopt_path}`.")
    hyperopt_path.write_text(strategy_text)


# Traceback (Exception)
2020-02-20 22:47:28,025 - freqtrade - ERROR - Fatal exception!
Traceback (most recent call last):
File "/opt/tradebot/freqtrade/.env/lib/python3.7/site-packages/talib/__init__.py", line 20, in wrapper
for arg in chain(args, kwargs.values())
StopIteration

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/freqtrade/freqtrade/main.py", line 36, in main
return_code = args['func'](args)
File "/freqtrade/freqtrade/commands/optimize_commands.py", line 76, in start_hyperopt
hyperopt.start()
File "/freqtrade/freqtrade/optimize/hyperopt.py", line 488, in start
preprocessed = self.backtesting.strategy.tickerdata_to_dataframe(data)
File "/freqtrade/freqtrade/strategy/interface.py", line 448, in tickerdata_to_dataframe
for pair, pair_data in tickerdata.items()}
File "/freqtrade/freqtrade/strategy/interface.py", line 448, in <dictcomp>
for pair, pair_data in tickerdata.items()}
File "/freqtrade/freqtrade/strategy/interface.py", line 464, in advise_indicators
return self.populate_indicators(dataframe, metadata)
File "/freqtrade/user_data/strategies/MyDev.py", line 205, in populate_indicators
dataframe['mfi'] = ta.MFI(dataframe)
File "talib/_abstract.pxi", line 352, in talib._ta_lib.Function.__call__
File "talib/_abstract.pxi", line 383, in talib._ta_lib.Function.__call_function
File "/opt/tradebot/freqtrade/.env/lib/python3.7/site-packages/talib/__init__.py", line 24, in wrapper
return func(*args, **kwargs)
File "talib/_func.pxi", line 8454, in talib._ta_lib.MFI
Exception: volume is not double

# Fixed code
def deploy_new_hyperopt(
    hyperopt_name: str, hyperopt_path: Path, subtemplate: str
) -> None:
    """
    Deploys a new hyperopt template to hyperopt_path
    """
    buy_guards = render_template(
        templatefile=f"subtemplates/hyperopt_buy_guards_{subtemplate}.j2",
    )
    sell_guards = render_template(
        templatefile=f"subtemplates/hyperopt_sell_guards_{subtemplate}.j2",
    )
    buy_space = render_template(
        templatefile=f"subtemplates/hyperopt_buy_space_{subtemplate}.j2",
    )
    sell_space = render_template(
        templatefile=f"subtemplates/hyperopt_sell_space_{subtemplate}.j2",
    )

    strategy_text = render_template(
        templatefile="base_hyperopt.py.j2",
        arguments={
            "hyperopt": hyperopt_name,
            "buy_guards": buy_guards,
            "sell_guards": sell_guards,
            "buy_space": buy_space,
            "sell_space": sell_space,
        },
    )

    logger.info(f"Writing hyperopt to `{hyperopt_path}`.")
    hyperopt_path.write_text(strategy_text)