yamlreader.py

from ruamel.yaml import YAML
from ruamel.yaml.constructor import SafeConstructor
# def construct_yaml_map(self, node):
# 	# test if there are duplicate node keys
# 	data = []
# 	yield data
# 	for key_node, value_node in node.value:
# 		key = self.construct_object(key_node, deep=True)
# 		val = self.construct_object(value_node, deep=True)
# 		data.append((key, val))
def construct_yaml_map(self, node):
    # test if there are duplicate node keys
    keys = set()
    for key_node, value_node in node.value:
        key = self.construct_object(key_node, deep=True)
        if key in keys:
            break
        keys.add(key)
    else:
        data = {}  # type: Dict[Any, Any]
        yield data
        value = self.construct_mapping(node)
        data.update(value)
        return
    data = []
    yield data
    for key_node, value_node in node.value:
        key = self.construct_object(key_node, deep=True)
        val = self.construct_object(value_node, deep=True)
        data.append((key, val))

SafeConstructor.add_constructor(u'tag:yaml.org,2002:map', construct_yaml_map)
yaml_overwrited = YAML(typ='safe')

def reader(content):
    try:
        parsed = yaml_overwrited.load(content)
        print("syntax is ok")
        return parsed
    except:
        print("yaml syntax error")