add iter, gener and list compr

michaelliao · michaelliao · commit fe13d542a3e5 · 2015-04-01T12:46:19.000+08:00
diff --git a/py3/advance/do_generator.py b/py3/advance/do_generator.py
@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+g = (x * x for x in range(10))
+print(g)
+for x in g:
+    print(x)
+
+def fib(max):
+    n, a, b = 0, 0, 1
+    while n < max:
+        yield b
+        a, b = b, a + b
+        n = n + 1
+
+f = fib(10)
+print('fib(10):', f)
+for x in f:
+    print(x)
diff --git a/py3/advance/do_iter.py b/py3/advance/do_iter.py
@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+from collections import Iterable
+print('iterable? [1, 2, 3]:', isinstance([1, 2, 3], Iterable))
+print('iterable? \'abc\':', isinstance('abc', Iterable))
+print('iterable? 123:', isinstance(123, Iterable))
+
+# iter list:
+print('iter [1, 2, 3, 4, 5]')
+for x in [1, 2, 3, 4, 5]:
+    print(x)
+
+d = {'a': 1, 'b': 2, 'c': 3}
+
+# iter each key:
+print('iter key:', d)
+for k in d.keys():
+    print('key:', k)
+
+# iter each value:
+print('iter value:', d)
+for v in d.values():
+    print('value:', v)
+
+# iter both key and value:
+print('iter item:', d)
+for k, v in d.items():
+    print('item:', k, v)
+
+# iter list with index:
+print('iter enumerate([\'A\', \'B\', \'C\']')
+for i, value in enumerate(['A', 'B', 'C']):
+    print(i, value)
+
+# iter complex list:
+print('iter [(1, 1), (2, 4), (3, 9)]:')
+for x, y in [(1, 1), (2, 4), (3, 9)]:
+    print(x, y)
diff --git a/py3/advance/do_listcompr.py b/py3/advance/do_listcompr.py
@@ -0,0 +1,12 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+print([x * x for x in range(1, 11)])
+print([x * x for x in range(1, 11) if x % 2 == 0])
+print([m + n for m in 'ABC' for n in 'XYZ'])
+
+d = {'x': 'A', 'y': 'B', 'z': 'C' }
+print([k + '=' + v for k, v in d.items()])
+
+L = ['Hello', 'World', 'IBM', 'Apple']
+print([s.lower() for s in L])
