Merge pull request #954 from freqtrade/feat/allow_backtest_plot

allow backtest ploting

docs/backtesting.md

@@ -70,6 +70,34 @@ Where `-s TestStrategy` refers to the class name within the strategy file `test_
 python3 ./freqtrade/main.py backtesting --export trades
 ```
 
+The exported trades can be read using the following code for manual analysis, or can be used by the plotting script `plot_dataframe.py` in the scripts folder.
+
+``` python
+import json
+from pathlib import Path
+import pandas as pd
+
+filename=Path('user_data/backtest_data/backtest-result.json')
+
+with filename.open() as file:
+        data = json.load(file)
+
+columns = ["pair", "profit", "opents", "closets", "index", "duration",
+           "open_rate", "close_rate", "open_at_end"]
+df = pd.DataFrame(data, columns=columns)
+
+df['opents'] = pd.to_datetime(df['opents'],
+                              unit='s',
+                              utc=True,
+                              infer_datetime_format=True
+                             )
+df['closets'] = pd.to_datetime(df['closets'],
+                               unit='s',
+                               utc=True,
+                               infer_datetime_format=True
+                              )
+```
+
 #### Exporting trades to file specifying a custom filename
 
 ```bash