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README.md

@@ -450,9 +450,10 @@ for i in range(10):
 
 ### Map, Filter, Reduce
 ```python
-map(lambda x: x + 1, range(10))     # [1, 2, ..., 10]
-filter(lambda x: x > 5, range(10))  # [6, 7, ..., 9]
-functools.reduce(lambda sum, x: sum+x, range(10))  # 45
+from functools import reduce
+<iter>     = map(lambda x: x + 1, range(10))          # (1, 2, ..., 10)
+<iter>     = filter(lambda x: x > 5, range(10))       # (6, 7, ..., 9)
+<any_type> = reduce(lambda sum, x: sum+x, range(10))  # 45
 ```
 
 ### Any, All