Python: Get The Status Of A Letter With GetLetterStatus()

"""
Simple script to get a letter's current status using the PostalMethods 
GetLetterStatus SOAP API call.
You must set your SOAP client with a reference to 
the PostalMethods Web Service: 
$ wsdl2py --url https://api.postalmethods.com/PostalWS.asmx?WSDL 
Detailed instructions available in the Python samples zip file
 
"""
 
from postalmethods import client
 
print 'Testing GetLetterStatus...'
c = client.PmClient('USERNAME','PASSWORD')
print '   Status of letter: ' + str(c.getLetterStatus(letterId)) 
 
"""
Result = -3000 means that the data was successfully retrieved.
A negative value means an error occurred.
See the PostalMethods Status Codes: http://www.postalmethods.com/statuscodes#webservice.
"""