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 GribFile
A GRIB file handle meant for use in a context manager.

Individual messages can be accessed using the ``next`` method. Of course,
it is also possible to iterate over each message in the file::

>>> with GribFile(filename) as grib:
...     # Print number of messages in file
...     len(grib)
...     # Open all messages in file
...     for msg in grib:
...         print(msg[key_name])

...

     len(grib.open_messages)

>>> # When the file is closed, any open messages are closed

>>> len(grib.open_messages)