Added missing space in yield

Author: kracekumar

src/4/creating_data_processing_pipelines/example.py

@@ -10,7 +10,7 @@ def gen_find(filepat, top):
     '''
     for path, dirlist, filelist in os.walk(top):
         for name in fnmatch.filter(filelist, filepat):
-            yield os.path.join(path,name)
+            yield os.path.join(path, name)
 
 def gen_opener(filenames):
     '''