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Problem

When trying to write out a GRIB or BUFR message to a file using codes_write, an error is generated (an exception is thrown)

Solution

You have written the following snippet to save a message into a binary file (GRIB or BUFR):

fout = open('temp.out', 'w')
codes_write(msg, fout)
fout.close()

The call to codes_write throws an exception:

Traceback (most recent call last):
  File "encode.py", line 85, in <module>
    sys.exit(main())
  File "encode.py", line 74, in main
    example(sys.argv[1])
  File "encode.py", line 61, in example
    codes_write(msg, fout)
  ...
    fileobj.write(msg_bytes)
TypeError: write() argument must be str, not bytes

Make sure you are using the BINARY MODE for reading and writing

Replace the 'w' with 'wb' in the call to open
fout = open('temp.out', 'wb')
This mode should be used for all files that do not contain text.

Problem

Solution

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