[英]REGO how to get object (map) keys that match a pattern
理解格式
mm = {
"x-foo": "a",
"x-bar": "b",
"y-foo": "c",
"y-bar": "d"
}
x_keys = [key for key in mm.keys() if key.startswith('x')]
print(x_keys)
或者
mm = {
"x-foo": "a",
"x-bar": "b",
"y-foo": "c",
"y-bar": "d"
}
for i in mm.keys():
if i.startswith('x'):
print(i)
希望这个对你有帮助。
这可以通过使用如您所建议的理解或生成 set的部分规则来完成:
x_foo_comprehension := [key | object[key]; startswith(key, "x-")]
x_foo_rule[key] {
object[key]
startswith(key, "x-")
}
最后,如果需要考虑嵌套键,可以使用内置的 walk 遍历 object:
x_foo_rule[key] {
walk(object, [path, value])
last := path[count(path) - 1]
startswith(last, "x-")
key := concat(".", path)
}
# x_foo_rule == {
# "x-bar",
# "x-foo",
# "y-bar.x-bar",
# "y-bar.x-foo"
# ]
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