python - Py2Neo:graph.cypher.execute()

有什么办法可以使此功能更美观/更易读吗？ （例如，格式化字符串，以便我没有“创建..” +标签+“ ...”）

from py2neo import Graph

graph = Graph()

def create_node(label, properties):
    """Create a note with the label-type and some properties"""
    graph.cypher.execute("CREATE (p:" + label + " " + properties + ")")

create_node("Person", "{name: 'Alice', age: '22'}")

最佳答案

您是否考虑过使用py2neo的内置方法？你会做

from py2neo import Node
alice = Node("Person", name="Alice", age=22)

如果您确实想使用Cypher，那么它将变得有些笨拙，因为您无法参数化标签。我还建议传递Python dict作为属性而不是字符串：

def create_node(label, properties):
    query = "CREATE (:{}".format(label) + " {properties})"
    params = dict(properties=properties)
    graph.cypher.execute(query, params)

create_node("Person", {"name":"Alice","age":22})

"CREATE (:{} {})".format(label, properties)不起作用的原因是因为字典的键将用引号引起来，这是无效的Cypher。例如：

>>> d = dict(name="Alice",age=22)
>>> label = "Person"
>>> "CREATE (:{} {})".format(label, properties)
"CREATE (:Person {'age': 22, 'name': 'Alice'})"

这将引发错误，因为有效的Cypher将是：

"CREATE (:Person {age: 22, name: 'Alice'})"

关于python - Py2Neo:graph.cypher.execute()，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/27784313/