Added utility function for file size determination.

Former-commit-id: 034561970dae25ae0b9c755129464f1e5fcf9755

kadmos/utilities/general.py

@@ -624,3 +624,35 @@ def translate_dict_keys(dictionary, translations):
         dictionary[key] = value
 
     return dictionary
+
+
+def convert_bytes(num):
+    """
+    this function will convert bytes to MB.... GB... etc
+    """
+    for x in ['bytes', 'KB', 'MB', 'GB', 'TB']:
+        if num < 1024.0:
+            return "%3.1f %s" % (num, x)
+        num /= 1024.0
+
+
+def file_size(file_path):
+    """
+    this function will return the file size
+    """
+    if os.path.isfile(file_path):
+        file_info = os.stat(file_path)
+        return convert_bytes(file_info.st_size)
+    else:
+        raise IOError('Could not find file: {}'.format(file_path))
+
+
+def file_size_MB(file_path):
+    """
+    this function will return the file size
+    """
+    if os.path.isfile(file_path):
+        file_info = os.stat(file_path)
+        return file_info.st_size/1024.0/1024.0
+    else:
+        raise IOError('Could not find file: {}'.format(file_path))