revert yield from and add pep8 / black required new lines

Author: Olaf Gladis

Level_08/generatoren.py

@@ -2,7 +2,9 @@
 
 # Generatoren und yield
 def gen(s):
-    yield from s
+    for char in s:
+        yield char
+
 
 # iterieren mit einer for-Schleife:
 for x in gen("abcdef"):
@@ -23,14 +25,17 @@ def f(x):
 # IN: f(3)
 # OUT: 9
 
+
 def dec(func):
     def inner_func(*args):
         print(args)
         r = func(*args)
         print("Return: {}".format(r))
         return r
+
     return inner_func
 
+
 @dec
 def f(x):
     return x**2