ex 2.1

readrides.py

@@ -1,24 +1,86 @@
 import csv
+from collections import namedtuple
+from dataclasses import dataclass
 
 
-def read_rides_as_tuples(filename):
-    """Read the bus ride data as a list of tuples"""
-    records = []
+@dataclass
+class DataClassRow:
+    route: str
+    date: str
+    daytype: str
+    rides: int
+
+
+class BasicRow:
+    def __init__(self, route, date, daytype, rides):
+        self.route = route
+        self.date = date
+        self.daytype = daytype
+        self.rides = rides
+
+
+class SlotsRow:
+    __slots__ = ['route', 'date', 'daytype', 'rides']
+
+    def __init__(self, route, date, daytype, rides):
+        self.route = route
+        self.date = date
+        self.daytype = daytype
+        self.rides = rides
+
+
+TupleRow = namedtuple('Row', ['route', 'date', 'daytype', 'rides'])
+
+
+def read_rides(filename, readfunc):
+    """Read the bus ride data using a conversion function."""
     with open(filename) as f:
         rows = csv.reader(f)
         next(rows)
-        for row in rows:
-            route = row[0]
-            date = row[1]
-            daytype = row[2]
-            rides = int(row[3])
-            record = (route, date, daytype, rides)
-            records.append(record)
-    return records
+        return [readfunc(row) for row in rows]
+
+
+def row_to_tuple(row):
+    return (row[0], row[1], row[2], int(row[3]))
+
+
+def row_to_dict(row):
+    return dict(route=row[0], date=row[1], daytype=row[2], rides=int(row[3]))
+
+
+def row_to_namedtuple(row):
+    return TupleRow(row[0], row[1], row[2], int(row[3]))
+
+
+def row_to_class(row):
+    return BasicRow(row[0], row[1], row[2], int(row[3]))
+
+
+def row_to_slotsclass(row):
+    return SlotsRow(row[0], row[1], row[2], int(row[3]))
+
+
+def row_to_dataclass(row):
+    return DataClassRow(route=row[0], date=row[1],
+                        daytype=row[2], rides=int(row[3]))
 
 
 if __name__ == '__main__':
+    import sys
     import tracemalloc
+    method = sys.argv[1]
+    methods = {
+        'tuple': row_to_tuple,
+        'dict': row_to_dict,
+        'namedtuple': row_to_namedtuple,
+        'class': row_to_class,
+        'slots': row_to_slotsclass,
+        'dataclass': row_to_dataclass,
+    }
+    if method not in methods:
+        print("unknown method")
+        sys.exit(-1)
     tracemalloc.start()
-    rows = read_rides_as_tuples('Data/ctabus.csv')
-    print('Memory Use: Current %d, Peak %d' % tracemalloc.get_traced_memory())
+    rows = read_rides('Data/ctabus.csv', methods[method])
+    print('Memory Use: Current %d, Peak %d;' % tracemalloc.get_traced_memory(),
+          'Method:', method)

readrides_data.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+for method in tuple dict namedtuple class slots dataclass; do
+    python readrides.py $method
+done