Update fetch_data.py

fetch_data.py

@@ -23,17 +23,17 @@ def fetch_data(user_access_key):
             papers_data['status'] = 'success'
             papers_data['data'] = {}
             with ThreadPoolExecutor() as executor:
-                arxiv_future = executor.submit(fetch_arxiv_data)
                 pmc_future = executor.submit(fetch_pmc_data)
-                arxiv_data = arxiv_future.result()
+                arxiv_future = executor.submit(fetch_arxiv_data)
                 pmc_data = pmc_future.result()
-            for topic, topic_data in arxiv_data.items():
+                arxiv_data = arxiv_future.result()
+            for topic, topic_data in pmc_data.items():
                 if topic_data['count'] == 0:
                     continue
                 else:
                     papers_data['data'][topic] = {}
                     papers_data['data'][topic]['ids'] = topic_data['ids']
-            for topic, topic_data in pmc_data.items():
+            for topic, topic_data in arxiv_data.items():
                 if topic_data['count'] == 0:
                     continue
                 else: