#331 Solve the orderdict index error for python3

Signed-off-by: Chin Yeung Li <[email protected]>

Author: chinyeungli

src/attributecode/model.py

@@ -1095,7 +1095,7 @@ def dumps(self, with_absent=False, with_empty=True):
             elif field.name == 'about_resource' and field.value:
                 about_data[field.name] = field.value[0]
             elif field.name in file_fields and field.value:
-                about_data[field.name] = field.value.keys()[0]
+                about_data[field.name] = list(field.value.keys())[0]
             else:
                 about_data[field.name] = field.value
         # Group the same license information in a list