Add splitLargeCSV.py utility script

Author: retiutut

Networking-Test-Kit/splitLargeCSV.py

@@ -0,0 +1,40 @@
+
+import os
+import csv
+
+
+def split(filehandler, delimiter=',', row_limit=4000000,
+          output_name_template='output_%s.csv', output_path='.', keep_headers=True):
+    
+    reader = csv.reader(filehandler, delimiter=delimiter)
+    current_piece = 1
+    current_out_path = os.path.join(
+        output_path,
+        output_name_template % current_piece
+    )
+    current_out_writer = csv.writer(open(current_out_path, 'w', newline=''), delimiter=delimiter)
+    current_limit = row_limit
+    headers = []
+    if keep_headers:
+        for i in range (5):
+            headerRow = next(reader);
+            headers.append(headerRow)
+            current_out_writer.writerow(headerRow)
+
+    for i, row in enumerate(reader):
+        if i + 1 > current_limit:
+            current_piece += 1
+            current_limit = row_limit * current_piece
+            current_out_path = os.path.join(
+                output_path,
+                output_name_template % current_piece
+            )
+            current_out_writer = csv.writer(open(current_out_path, 'w', newline=''), delimiter=delimiter)
+            if keep_headers:
+                for headerRowI in headers:
+                    current_out_writer.writerow(headerRowI)
+                    print (headerRowI) 
+            print (i)    
+        current_out_writer.writerow(row)
+
+split(open('OpenBCI-RAW-2021-04-05_21-49-12.txt', 'r'));