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#!/usr/bin/python
# long version of this one liner: python -c 'import yaml,sys;yaml.safe_load(sys.stdin)' < yamltest.txt
import yaml
import sys
if len(sys.argv) > 1:
check_file = open(sys.argv[1])
else:
check_file = sys.stdin
try:
yaml.safe_load(check_file)
except yaml.scanner.ScannerError as e:
sys.exit('Invalid YAML:\n%s' % str(e))
print('valid YAML')
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