Issue-1: Implement better printing of the explanations

Author: PiotrZakrzewski

mbdiff/__main__.py

@@ -1,6 +1,7 @@
 import click
 from mbdiff.diff_query import DiffQuery
 from mbdiff.diff import diff_file
+from mbdiff.pretty_print import present_explanations
 
 
 @click.command()
@@ -15,8 +16,7 @@ def main(data, min_support, min_risk, max_order, query):
     explanations = diff_file(data, query, max_order, min_risk, min_support)
     print("Explanations")
     explanations = sorted(explanations, key=lambda x: x[0], reverse=True)
-    for rr, combination in explanations:
-        print(rr, combination)
+    print(present_explanations(explanations))
 
 
 if __name__ == "__main__":

mbdiff/pretty_print.py

@@ -0,0 +1,16 @@
+"""Present explanations in a more approachable way."""
+from typing import List
+from tabulate import tabulate
+from pandas import DataFrame
+
+
+def present_explanations(explanations: List) -> str:
+    pres_df = []
+    for score, explanation in explanations:
+        row = {"score": score}
+        row = {**row, **explanation}
+        pres_df.append(row)
+    pres_df = DataFrame(pres_df)
+    # NaN means "any value", represent as "-" just like in the original paper
+    pres_df.fillna("-", inplace=True)
+    return tabulate(pres_df, headers="keys")