fix bugs

.travis.yml

@@ -2,8 +2,8 @@ dist: xenial
 language: python
 python:
 #    - "2.7"
-    - "3.6"
     - "3.5"
+    - "3.6"
     - "3.7"
     - "3.8"
 script:

README.md

@@ -6,7 +6,6 @@
 
 # wavinfo
 
-
 The `wavinfo` package allows you to probe WAVE and [RF64/WAVE files][eburf64] and extract extended metadata, with an emphasis on film, video and professional music production metadata.
 
 `wavinfo` reads:
@@ -32,8 +31,6 @@ In progress:
 [eburf64]:https://tech.ebu.ch/docs/tech/tech3306v1_1.pdf
 [info-tags]:https://exiftool.org/TagNames/RIFF.html#Info
 
-
-
 ## Demonstration
 
 The entry point for wavinfo is the WavInfoReader class.
@@ -67,11 +64,6 @@ The length of the file in frames (interleaved samples) and bytes is available, a
 
 Python 3.5 support is deprecated.
 
-
 ## Other Resources
 
 * For other file formats and ID3 decoding, look at [audio-metadata](https://github.com/thebigmunch/audio-metadata).
-
-
-
-

wavinfo/wave_reader.py

@@ -132,7 +132,7 @@ class WavInfoReader:
         scopes = ('fmt', 'data')  # 'bext', 'ixml', 'info')
 
         for scope in scopes:
-            attr: WavAudioFormat = self.__getattribute__(scope)
+            attr = self.__getattribute__(scope)
             for field in attr._fields:
                 yield scope, field, attr.__getattribute__(field)