auto save

data.csv

+id.name.age
+10001.Mike.20
+10002.Bob.22
+10003.Jordan.21

my_csv.py

+# import csv
+# with open('data.csv', 'w', newline='')as csvfile:    
+#     fieldnames = ['id', 'name', 'age']    
+#     writer = csv.DictWriter(csvfile, fieldnames=fieldnames)    
+#     writer.writeheader()    
+#     writer.writerow({'id': '10001', 'name': 'Mike', 'age': 20})    
+#     writer.writerow({'id': '10002', 'name': 'Bob', 'age': 22})    
+#     writer.writerow({'id': '10003', 'name': 'Jordan', 'age': 21})
+
+import csv
+with open('data.csv', 'w', newline='')as csvfile:    
+    writer = csv.writer(csvfile, delimiter='.')    
+    writer.writerow(['id', 'name', 'age'])    
+    writer.writerow(['10001', 'Mike', 20])    
+    writer.writerow(['10002', 'Bob', 22])    
+    writer.writerow(['10003', 'Jordan', 21])
\ No newline at end of file