remove f-strings for py2 compatibility

biodblinks/lablinks/command.py

@@ -23,7 +23,7 @@ class LabsLinkCommand(BaseCommand):
 
     def generate_profile_file(self, profile_file_path):
         self.stdout.write(
-            self.style.SUCCESS(f"Generating the Profile file in {profile_file_path}...")
+            self.style.SUCCESS("Generating the Profile file in {profile_file_path}...".format(profile_file_path=profile_file_path))
         )
         provider_id = settings.LABLINKS_PROVIDER_ID
         resource_name = settings.LABLINKS_RESOURCE_NAME
@@ -44,13 +44,13 @@ class LabsLinkCommand(BaseCommand):
             profile_file.write(xml_string)
         self.stdout.write(
             self.style.SUCCESS(
-                f"Successfully generated the Profile file in {profile_file_path}..."
+                "Successfully generated the Profile file in {profile_file_path}...".format(profile_file_path=profile_file_path)
             )
         )
 
     def generate_links_file(self, links_file_path):
         self.stdout.write(
-            self.style.SUCCESS(f"Generating the Links file in {links_file_path}...")
+            self.style.SUCCESS("Generating the Links file in {links_file_path}...".format(links_file_path=links_file_path))
         )
         XMLSerializer = serializers.get_serializer("labslink-xml")
         xml_serializer = XMLSerializer()
@@ -61,7 +61,7 @@ class LabsLinkCommand(BaseCommand):
             links_file.write(xml_string)
         self.stdout.write(
             self.style.SUCCESS(
-                f"Successfully generated the Links file in {links_file_path}..."
+                "Successfully generated the Links file in {links_file_path}...".format(links_file_path=links_file_path)
             )
         )