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#!/usr/bin/env python3
"""Utility to return YAML value from key in YAML file."""
import optparse
import yaml
def get_yaml_value(yaml_file, yaml_key):
"""Return string value for 'yaml_key' from 'yaml_file'."""
with open(yaml_file, "r") as ystream:
yaml_dict = yaml.safe_load(ystream)
return str(yaml_dict.get(yaml_key, ""))
def main():
"""Execute Main program."""
parser = optparse.OptionParser(description=__doc__)
parser.add_option("--yamlFile", dest="yaml_file", default=None, help="YAML file to read")
parser.add_option("--yamlKey", dest="yaml_key", default=None,
help="Top level YAML key to provide the value")
(options, _) = parser.parse_args()
if not options.yaml_file:
parser.error("Must specifiy '--yamlFile'")
if not options.yaml_key:
parser.error("Must specifiy '--yamlKey'")
print(get_yaml_value(options.yaml_file, options.yaml_key))
if __name__ == "__main__":
main()
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