class 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) |