corrects some mistakes

collect.py

@@ -188,22 +188,22 @@ print(timeStartScrape.strftime(fTimeFormat))
 print("---")
 
 # Iterate over each Twitter account using multiprocessing
-with concurrent.futures.ThreadPoolExecutor() as executor:
+# Iterate over each Twitter account using multiprocessing
+with concurrent.futures.ProcessPoolExecutor() as executor:
     # List to store the scraping tasks
     tasks = []
-
     for handle in accounts:
         # Iterate over each time slice
         for slice_data in time_slices:
-            # ... code to prepare the slice_data ...
-
+            # ... Code to prepare the slice_data ...
             # Schedule the scraping task
-            task = executor.submit(scrapeTweets, handle, slice_data, keywords, td, tweetDFColumns)
+            task = executor.submit(
+                scrapeTweets, handle, slice_data, keywords, td, tweetDFColumns
+            )
             tasks.append(task)
-
     # Wait for all tasks to complete
     concurrent.futures.wait(tasks)
-
+    
 timeEndScrape = datetime.now()
 print("---")
 print("End of scraping at:")
@@ -227,7 +227,7 @@ with open(f"{logfile}missing-"+timeStartScrape.strftime(fTimeFormat)+".txt", "w"
 if file_alltweets in tweetfiles:
     tweetfiles.remove(file_alltweets)
 # Go through all csv files and merge them into file_alltweets
-if len(tweetfiles) > 0:
+if tweetfiles:
     with open(file_alltweets, "wb") as fout:
         # first file (because of the header):
         with open(tweetfiles[0], "rb") as f: