Change str format to f-strings. (#3975)

Co-authored-by: Bu Sun Kim <[email protected]>

Author: sdlin

firestore/cloud-client/snippets.py

@@ -61,7 +61,7 @@ def quickstart_get_collection():
     docs = users_ref.stream()
 
     for doc in docs:
-        print(u'{} => {}'.format(doc.id, doc.to_dict()))
+        print(f'{doc.id} => {doc.to_dict()}')
     # [END quickstart_get_collection]
 
 
@@ -149,9 +149,14 @@ def to_dict(self):
 
     def __repr__(self):
         return(
-            u'City(name={}, country={}, population={}, capital={}, regions={})'
-            .format(self.name, self.country, self.population, self.capital,
-                    self.regions))
+            f'City(\
+                name={self.name}, \
+                country={self.country}, \
+                population={self.population}, \
+                capital={self.capital}, \
+                regions={self.regions}\
+            )'
+        )
 # [END custom_class_def]
 
 
@@ -219,7 +224,7 @@ def get_check_exists():
 
     doc = doc_ref.get()
     if doc.exists:
-        print(u'Document data: {}'.format(doc.to_dict()))
+        print(f'Document data: {doc.to_dict()}')
     else:
         print(u'No such document!')
     # [END get_check_exists]
@@ -242,7 +247,7 @@ def get_simple_query():
     docs = db.collection(u'cities').where(u'capital', u'==', True).stream()
 
     for doc in docs:
-        print(u'{} => {}'.format(doc.id, doc.to_dict()))
+        print(f'{doc.id} => {doc.to_dict()}')
     # [END get_simple_query]
 
 
@@ -255,7 +260,7 @@ def array_contains_filter():
     # [END fs_array_contains_filter]
     docs = query.stream()
     for doc in docs:
-        print(u'{} => {}'.format(doc.id, doc.to_dict()))
+        print(f'{doc.id} => {doc.to_dict()}')
 
 
 def get_full_collection():
@@ -264,7 +269,7 @@ def get_full_collection():
     docs = db.collection(u'cities').stream()
 
     for doc in docs:
-        print(u'{} => {}'.format(doc.id, doc.to_dict()))
+        print(f'{doc.id} => {doc.to_dict()}')
     # [END get_full_collection]
 
 
@@ -332,7 +337,7 @@ def update_doc_array():
     city_ref.update({u'regions': firestore.ArrayRemove([u'east_coast'])})
     # [END fs_update_doc_array]
     city = city_ref.get()
-    print(u'Updated the regions field of the DC. {}'.format(city.to_dict()))
+    print(f'Updated the regions field of the DC. {city.to_dict()}')
 
 
 def update_multiple():
@@ -622,7 +627,7 @@ def snapshot_cursors():
     # [END fs_start_at_snapshot_query_cursor]
     results = start_at_snapshot.limit(10).stream()
     for doc in results:
-        print(u'{}'.format(doc.id))
+        print(f'{doc.id}')
 
     return results
 
@@ -667,7 +672,7 @@ def listen_document():
     # Create a callback on_snapshot function to capture changes
     def on_snapshot(doc_snapshot, changes, read_time):
         for doc in doc_snapshot:
-            print(u'Received document snapshot: {}'.format(doc.id))
+            print(f'Received document snapshot: {doc.id}')
         callback_done.set()
 
     doc_ref = db.collection(u'cities').document(u'SF')
@@ -705,7 +710,7 @@ def on_snapshot(col_snapshot, changes, read_time):
         print(u'Callback received query snapshot.')
         print(u'Current cities in California:')
         for doc in col_snapshot:
-            print(u'{}'.format(doc.id))
+            print(f'{doc.id}')
         callback_done.set()
 
     col_query = db.collection(u'cities').where(u'state', u'==', u'CA')
@@ -741,11 +746,11 @@ def on_snapshot(col_snapshot, changes, read_time):
         print(u'Current cities in California: ')
         for change in changes:
             if change.type.name == 'ADDED':
-                print(u'New city: {}'.format(change.document.id))
+                print(f'New city: {change.document.id}')
             elif change.type.name == 'MODIFIED':
-                print(u'Modified city: {}'.format(change.document.id))
+                print(f'Modified city: {change.document.id}')
             elif change.type.name == 'REMOVED':
-                print(u'Removed city: {}'.format(change.document.id))
+                print(f'Removed city: {change.document.id}')
                 delete_done.set()
 
     col_query = db.collection(u'cities').where(u'state', u'==', u'CA')
@@ -835,7 +840,7 @@ def delete_collection(coll_ref, batch_size):
         deleted = 0
 
         for doc in docs:
-            print(u'Deleting doc {} => {}'.format(doc.id, doc.to_dict()))
+            print(f'Deleting doc {doc.id} => {doc.to_dict()}')
             doc.reference.delete()
             deleted = deleted + 1
 
@@ -905,7 +910,7 @@ def collection_group_query(db):
         .where(u'type', u'==', u'museum')
     docs = museums.stream()
     for doc in docs:
-        print(u'{} => {}'.format(doc.id, doc.to_dict()))
+        print(f'{doc.id} => {doc.to_dict()}')
     # [END fs_collection_group_query]
     return docs