better Path usage, remove arg parameter in generate_graph

scripts/plot_dataframe.py

@@ -76,7 +76,7 @@ def load_trades(args: Namespace, pair: str, timerange: TimeRange) -> pd.DataFram
         # must align with columns in backtest.py
         columns = ["pair", "profit", "opents", "closets", "index", "duration",
                    "open_rate", "close_rate", "open_at_end", "sell_reason"]
-        if os.path.exists(file):
+        if file.exists():
             with file.open() as f:
                 data = json.load(f)
                 trades = pd.DataFrame(data, columns=columns)
@@ -113,11 +113,7 @@ def generate_plot_file(fig, pair, tick_interval, is_last) -> None:
     pair_name = pair.replace("/", "_")
     file_name = 'freqtrade-plot-' + pair_name + '-' + tick_interval + '.html'
 
-    if not os.path.exists('user_data/plots'):
-        try:
-            os.makedirs('user_data/plots')
-        except OSError as e:
-            raise
+    Path("user_data/plots").mkdir(parents=True, exist_ok=True)
 
     plot(fig, filename=str(Path('user_data/plots').joinpath(file_name)), auto_open=False)
     if is_last:
@@ -215,13 +211,20 @@ def extract_trades_of_period(dataframe, trades) -> pd.DataFrame:
     return trades
 
 
-def generate_graph(pair, trades: pd.DataFrame, data: pd.DataFrame, args) -> tools.make_subplots:
+def generate_graph(
+                    pair: str,
+                    trades: pd.DataFrame,
+                    data: pd.DataFrame,
+                    indicators1: str,
+                    indicators2: str
+                ) -> tools.make_subplots:
     """
     Generate the graph from the data generated by Backtesting or from DB
     :param pair: Pair to Display on the graph
     :param trades: All trades created
     :param data: Dataframe
-    :param args: sys.argv that contrains the two params indicators1, and indicators2
+    :indicators1: String Main plot indicators
+    :indicators2: String Sub plot indicators
     :return: None
     """
 
@@ -322,7 +325,7 @@ def generate_graph(pair, trades: pd.DataFrame, data: pd.DataFrame, args) -> tool
         fig.append_trace(bb_lower, 1, 1)
         fig.append_trace(bb_upper, 1, 1)
 
-    fig = generate_row(fig=fig, row=1, raw_indicators=args.indicators1, data=data)
+    fig = generate_row(fig=fig, row=1, raw_indicators=indicators1, data=data)
     fig.append_trace(buys, 1, 1)
     fig.append_trace(sells, 1, 1)
     fig.append_trace(trade_buys, 1, 1)
@@ -337,7 +340,7 @@ def generate_graph(pair, trades: pd.DataFrame, data: pd.DataFrame, args) -> tool
     fig.append_trace(volume, 2, 1)
 
     # Row 3
-    fig = generate_row(fig=fig, row=3, raw_indicators=args.indicators2, data=data)
+    fig = generate_row(fig=fig, row=3, raw_indicators=indicators2, data=data)
 
     return fig
 
@@ -435,7 +438,8 @@ def analyse_and_plot_pairs(args: Namespace):
             pair=pair,
             trades=trades,
             data=dataframe,
-            args=args
+            indicators1=args.indicators1,
+            indicators2=args.indicators2
         )
 
         is_last = (False, True)[pair_counter == len(tickers)]