I am looking to try porting over my application from Python 2.7 to Python 
3.6 and have run into snags.

The first being that Pyglet uses BytesIO for version 3 instead of StringIO. 
I am using a ZIPLocation.

I can no longer seem to use pyglet.resource.file for things that require a 
file-like object.

Example:

```
#!python

cfg = configparser.ConfigParser()
file_obj = pyglet.resource.file(filename)
cfg.read_file(file_obj)
```


Will produce an error: 

```
#!python

File "c:\python36-32\lib\configparser.py", line 1031, in _read
    if line.strip().startswith(prefix):
builtins.TypeError: startswith first arg must be bytes or a tuple of bytes, 
not
str
```

However BytesIO should be considered bytes? If I try to convert the BytesIO 
to pure bytes like it says it wants, using:

```
#!python

file_obj = pyglet.resource.file(filename).getvalue()
```


I then get the error: 

```
#!python

File "c:\python36-32\lib\configparser.py", line 1031, in _read
    if line.strip().startswith(prefix):
```

builtins.AttributeError: 'int' object has no attribute 'strip'

I can't seem to get this BytesIO to actually work as a file-like object. 
What am I missing?

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