csv.writer：需要运行循环，但在一次迭代后停止

Question

I am attempting to pull from an API. The file runs fine if coded to run a single time. But I am having issues when coded to run once every minute ( x[5]==0 ). The program does pull from the API (as evidenced by <print(i)> ), but doesn't seem to interact with the CSV file.

import csv
import time

c = open("file.csv", "a")
w = csv.writer(c, lineterminator="\n")

while True:
  x = time.localtime()
    if x[5]==0:

      client.request(r)
      print(i)
      for i in r.response["list"]
      w.writerow([i["list_item1"], i["list_item2"]])

The program will loop through and print , but it will not write to "file.csv" . I attempted to get the CSV file to close .

      client.request(r)
      print(i)
      for i in r.response["list"]
      w.writerow([i["list_item1"], i["list_item2"]])
      c.close()

With this, the program will loop through once, write to "file.csv" once, then shut down with the following error:

    w.writerow([i["list_item1"], i["list_item2"]])
ValueError: I/O operation on closed file.

I tried adding a with statement in a few places, but I couldn't get anything to work.

How can I get this to work?

Answer 1

your code looks fine. you don't need c.close()

just add c.flush() at the end of your code . as you have infinite while loop you just need to flush data into you csv file.

hope this fixes your issue.

 Note flush() does not necessarily write the file’s data to disk. Use flush() followed by os.fsync() to ensure this behavior. 

read this file.flush