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//lib/python2.7/dist-packages/euca2ools/commands/monitoring/argtypes.py

# Copyright 2013 Eucalyptus Systems, Inc.
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import argparse

def cloudwatch_dimension(dim_as_str):
    try:
        name, val = dim_as_str.split('=', 1)
        return {'Name': name, 'Value': val}
    except ValueError:
        raise argparse.ArgumentTypeError('dimension filter "{0}" must have '
                                         'form KEY=VALUE'.format(dim_as_str))