# Buggy code
def deploy_new_strategy(strategy_name, strategy_path: Path, subtemplate: str):
    """
    Deploy new strategy from template to strategy_path
    """
    indicators = render_template(
        templatefile=f"subtemplates/indicators_{subtemplate}.j2",
    )
    buy_trend = render_template(
        templatefile=f"subtemplates/buy_trend_{subtemplate}.j2",
    )
    sell_trend = render_template(
        templatefile=f"subtemplates/sell_trend_{subtemplate}.j2",
    )
    plot_config = render_template(
        templatefile=f"subtemplates/plot_config_{subtemplate}.j2",
    )

    strategy_text = render_template(
        templatefile="base_strategy.py.j2",
        arguments={
            "strategy": strategy_name,
            "indicators": indicators,
            "buy_trend": buy_trend,
            "sell_trend": sell_trend,
            "plot_config": plot_config,
        },
    )

    logger.info(f"Writing strategy to `{strategy_path}`.")
    strategy_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_strategy(
    strategy_name: str, strategy_path: Path, subtemplate: str
) -> None:
    """
    Deploy new strategy from template to strategy_path
    """
    indicators = render_template(
        templatefile=f"subtemplates/indicators_{subtemplate}.j2",
    )
    buy_trend = render_template(
        templatefile=f"subtemplates/buy_trend_{subtemplate}.j2",
    )
    sell_trend = render_template(
        templatefile=f"subtemplates/sell_trend_{subtemplate}.j2",
    )
    plot_config = render_template(
        templatefile=f"subtemplates/plot_config_{subtemplate}.j2",
    )

    strategy_text = render_template(
        templatefile="base_strategy.py.j2",
        arguments={
            "strategy": strategy_name,
            "indicators": indicators,
            "buy_trend": buy_trend,
            "sell_trend": sell_trend,
            "plot_config": plot_config,
        },
    )

    logger.info(f"Writing strategy to `{strategy_path}`.")
    strategy_path.write_text(strategy_text)