diff --git a/projects/project-3/openapi/read_csv.py b/projects/project-3/openapi/read_csv.py
index 62e39c2..31d9ac3 100644
--- a/projects/project-3/openapi/read_csv.py
+++ b/projects/project-3/openapi/read_csv.py
@@ -2,25 +2,43 @@ import csv
 import os
 
 
-def read_files(base_dir):
+def read_files(base_dir, max_num=2):
     data = []
     for file in os.listdir(base_dir):
+        if max_num == 0:
+            break
         print(f'reading file \'{file}\'')
-        with open(os.path.join('data', file), 'r') as input_file:
+        with open(os.path.join(base_dir, file), 'r', newline='') as input_file:
             data.extend(list(csv.DictReader(input_file)))
+        max_num -= 1
     return data
 
 
+def get_key_counts(data):
+    all_key_sets = [e.keys() for e in data]
+    key_counts = {}
+    for key_set in all_key_sets:
+        for key in key_set:
+            try:
+                key_counts[key] += 1
+            except KeyError:
+                key_counts[key] = 1
+    return key_counts
+
+
 def main():
-    data = read_files('data')
-    print(data[0])
+    data = read_files('data/usage-stats', max_num=10)
     print("Sorting")
-    data = sorted(data, key=lambda entry: int(entry['SERIAL_NUMBER']))
-    print(data[0])
+    data = sorted(data, key=lambda entry: int(entry['Rental Id']))
     print(f'final length of data {len(data)}')
 
-    with open('test.csv', 'w') as out_file:
-        writer = csv.DictWriter(out_file, data[0].keys())
+    # counts = get_key_counts(data)
+    # for count, val in counts.items():
+    #     if val != len(data):
+    #         print(count, val)
+    # print(counts)
+    with open('test.csv', 'w', newline='') as out_file:
+        writer = csv.DictWriter(out_file, data[0].keys(), extrasaction='ignore')
         writer.writeheader()
         writer.writerows(data)