# Buggy code
def generate_edge_table(results: dict) -> str:
    floatfmt = ("s", ".10g", ".2f", ".2f", ".2f", ".2f", "d", ".d")
    tabular_data = []
    headers = [
        "pair",
        "stoploss",
        "win rate",
        "risk reward ratio",
        "required risk reward",
        "expectancy",
        "total number of trades",
        "average duration (min)",
    ]

    for result in results.items():
        if result[1].nb_trades > 0:
            tabular_data.append(
                [
                    result[0],
                    result[1].stoploss,
                    result[1].winrate,
                    result[1].risk_reward_ratio,
                    result[1].required_risk_reward,
                    result[1].expectancy,
                    result[1].nb_trades,
                    round(result[1].avg_trade_duration),
                ]
            )

    # Ignore type as floatfmt does allow tuples but mypy does not know that
    return tabulate(tabular_data, headers=headers, floatfmt=floatfmt, tablefmt="pipe")  # type: ignore


# 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 generate_edge_table(results: dict) -> str:
    floatfmt = ("s", ".10g", ".2f", ".2f", ".2f", ".2f", "d", ".d")
    tabular_data = []
    headers = [
        "Pair",
        "Stoploss",
        "Win Rate",
        "Risk Reward Ratio",
        "Required Risk Reward",
        "Expectancy",
        "Total Number of Trades",
        "Average Duration (min)",
    ]

    for result in results.items():
        if result[1].nb_trades > 0:
            tabular_data.append(
                [
                    result[0],
                    result[1].stoploss,
                    result[1].winrate,
                    result[1].risk_reward_ratio,
                    result[1].required_risk_reward,
                    result[1].expectancy,
                    result[1].nb_trades,
                    round(result[1].avg_trade_duration),
                ]
            )

    # Ignore type as floatfmt does allow tuples but mypy does not know that
    return tabulate(tabular_data, headers=headers, floatfmt=floatfmt, tablefmt="pipe")  # type: ignore