plot script can take arguments

scripts/plot_dataframe.py

@@ -1,17 +1,33 @@
 #!/usr/bin/env python3
 
+import sys
+import argparse
 import matplotlib  # Install PYQT5 manually if you want to test this helper function
 matplotlib.use("Qt5Agg")
 import matplotlib.pyplot as plt
 from freqtrade import exchange, analyze
+from freqtrade.misc import parse_args_common
 
 
-def plot_analyzed_dataframe(pair: str) -> None:
+def plot_parse_args(args ):
+    parser = parse_args_common(args, 'Graph utility')
+    parser.add_argument(
+        '-p', '--pair',
+        help = 'What currency pair',
+        dest = 'pair',
+        default = 'BTC_ETH',
+        type = str,
+    )
+    return parser.parse_args(args)
+
+
+def plot_analyzed_dataframe(args) -> None:
     """
     Calls analyze() and plots the returned dataframe
     :param pair: pair as str
     :return: None
     """
+    pair = args.pair
 
     # Init Bittrex to use public API
     exchange._API = exchange.Bittrex({'key': '', 'secret': ''})
@@ -50,4 +66,5 @@ def plot_analyzed_dataframe(pair: str) -> None:
 
 
 if __name__ == '__main__':
-    plot_analyzed_dataframe('BTC_ETH')
+    args = plot_parse_args(sys.argv[1:])
+    plot_analyzed_dataframe(args)