Add md5file into dataset/common.py, and unit test in tests/common_test.py

python/paddle/v2/dataset/common.py

@@ -3,7 +3,7 @@ import os
 import shutil
 import urllib2
 
-__all__ = ['DATA_HOME', 'download']
+__all__ = ['DATA_HOME', 'download', 'md5file']
 
 DATA_HOME = os.path.expanduser('~/.cache/paddle/dataset')
 
@@ -11,7 +11,7 @@ if not os.path.exists(DATA_HOME):
     os.makedirs(DATA_HOME)
 
 
-def download(url, md5):
+def download(url, package_name, md5):
     filename = os.path.split(url)[-1]
     assert DATA_HOME is not None
     filepath = os.path.join(DATA_HOME, md5)
@@ -34,3 +34,12 @@ def download(url, md5):
         with open(__full_file__, mode='wb') as of:
             shutil.copyfileobj(fsrc=response, fdst=of)
     return __full_file__
+
+
+def md5file(fname):
+    hash_md5 = hashlib.md5()
+    f = open(fname, "rb")
+    for chunk in iter(lambda: f.read(4096), b""):
+        hash_md5.update(chunk)
+    f.close()
+    return hash_md5.hexdigest()

python/paddle/v2/dataset/tests/common_test.py

+import paddle.v2.dataset.common
+import unittest
+import tempfile
+
+class TestCommon(unittest.TestCase):
+    def test_md5file(self):
+        _, temp_path =tempfile.mkstemp()
+        f = open(temp_path, 'w')
+        f.write("Hello\n")
+        f.close()
+        self.assertEqual(
+            '09f7e02f1290be211da707a266f153b3',
+            paddle.v2.dataset.common.md5file(temp_path))
+
+if __name__ == '__main__':
+    unittest.main()