fix small issue of dttm PR (#688)

caravel/data/__init__.py

@@ -1065,7 +1065,6 @@ def load_multiformat_time_series_data():
         'string3': ['%Y/%m/%d%H:%M:%S.%f', None],
     }
     for col in obj.table_columns:
-        print(col.column_name)
         dttm_and_expr = dttm_and_expr_dict[col.column_name]
         col.python_date_format = dttm_and_expr[0]
         col.dbatabase_expr = dttm_and_expr[1]
@@ -1075,8 +1074,7 @@ def load_multiformat_time_series_data():
     tbl = obj
 
     print("Creating some slices")
-    i = 0
-    for col in tbl.table_columns:
+    for i, col in enumerate(tbl.table_columns):
         slice_data = {
             "granularity_sqla": col.column_name,
             "datasource_id": "8",
@@ -1099,5 +1097,4 @@ def load_multiformat_time_series_data():
             table=tbl,
             params=get_slice_json(slice_data),
         )
-        i += 1
         merge_slice(slc)