Redo AC example

Old example uses dataset that doesn't contain dates in proper format
but the main functionality is similar, so I decided to change the
dataset

examples/algebraic_constraints.py

@@ -1,17 +1,19 @@
 import desbordante
 import pandas
 import operator
+from datetime import datetime
 
-TABLE = 'examples/datasets/cargo_march.csv'
+# Note that dates in the given dataset must be in the format Y-M-D
+TABLE = 'examples/datasets/ACShippingDates.csv'
 HEADER = 0
 SEPARATOR = ','
-P_FUZZ = 0.85
-FUZZINESS = 0.2
+P_FUZZ = 0.7
+FUZZINESS = 0.3
 BUMPS_LIMIT = 0
 WEIGHT = 0.1
 BIN_OPERATION = '-'
 AC_SEED = 11
-ITERATIONS_LIMIT = 4
+ITERATIONS_LIMIT = 10
 OPERATIONS = {
     '+': (operator.add, 'Sum'),
     '-': (operator.sub, 'Difference'),
@@ -23,7 +25,7 @@
 algo = desbordante.ACAlgorithm()
 
 df = pandas.read_csv(TABLE, sep=SEPARATOR, header=HEADER)
-df_without_id = df[['Delivery date', 'Dispatch date']]
+df_without_id = df[['deliveryDate', 'shipDate']]
 
 algo.load_data(df=df_without_id)
 
@@ -33,18 +35,20 @@
 ac_ranges = algo.get_ac_ranges()
 for ac_range in ac_ranges:
     l_col = df_without_id.columns[ac_range.column_indices[0]]
-    r_col = df_without_id.columns[ac_range.column_indices[1]] 
+    r_col = df_without_id.columns[ac_range.column_indices[1]]
     print(f'Discovered ranges for ({l_col} {BIN_OPERATION} {r_col}) are:')
     print(ac_range.ranges)
 
 ac_exceptions = algo.get_ac_exceptions()
 print()
 print(f'Rows in which the result of the chosen operation ({BIN_OPERATION}) is outside of discovered ranges:')
 for ac_exception in ac_exceptions:
-    id, delivery_date, dispatch_date = df.iloc[ac_exception.row_index]
+    id, delievery_date, ship_date = df.iloc[ac_exception.row_index]
     print(f'id: {id}')
-    print(f'Dispatch date: {dispatch_date}')
-    print(f'Delivery date: {delivery_date}')
-    print(f'{operation_name}: {operation(delivery_date, dispatch_date)}')
+    print(f'Shipping date : {ship_date}')
+    print(f'Delivery date: {delievery_date}')
+    date1 = datetime.strptime(ship_date, '%Y-%m-%d').date()
+    date2 = datetime.strptime(delievery_date, '%Y-%m-%d').date()
+    print(f'{operation_name}: {operation(date2, date1).days}')
     print()