add struct, collections and hashlib sample

michaelliao · michaelliao · commit f58e9ea230d8 · 2015-04-01T14:40:28.000+08:00
diff --git a/py3/commonlib/check_bmp.py b/py3/commonlib/check_bmp.py
@@ -0,0 +1,8 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import struct
+
+bmp_header = b'\x42\x4d\x38\x8c\x0a\x00\x00\x00\x00\x00\x36\x00\x00\x00\x28\x00\x00\x00\x80\x02\x00\x00\x68\x01\x00\x00\x01\x00\x18\x00'
+
+print(struct.unpack('<ccIIIIIIHH', bmp_header))
diff --git a/py3/commonlib/use_collections.py b/py3/commonlib/use_collections.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+from collections import namedtuple
+
+Point = namedtuple('Point', ['x', 'y'])
+p = Point(1, 2)
+print('Point:', p.x, p.y)
+
+from collections import deque
+
+q = deque(['a', 'b', 'c'])
+q.append('x')
+q.appendleft('y')
+print(q)
+
+from collections import defaultdict
+
+dd = defaultdict(lambda: 'N/A')
+dd['key1'] = 'abc'
+print('dd[\'key1\'] =', dd['key1'])
+print('dd[\'key2\'] =', dd['key2'])
+
+from collections import Counter
+c = Counter()
+for ch in 'programming':
+    c[ch] = c[ch] + 1
+print(c)
diff --git a/py3/commonlib/use_hashlib.py b/py3/commonlib/use_hashlib.py
@@ -0,0 +1,13 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import hashlib
+
+md5 = hashlib.md5()
+md5.update('how to use md5 in python hashlib?'.encode('utf-8'))
+print(md5.hexdigest())
+
+sha1 = hashlib.sha1()
+sha1.update('how to use sha1 in '.encode('utf-8'))
+sha1.update('python hashlib?'.encode('utf-8'))
+print(sha1.hexdigest())
