I try my best to exmplain but if it is not clear add a comment.

I need to implement some fucntion that will take 2 arguments:

1. First one contains data. Some class or dict. There is no knoledge what object is - dictionary or class
2. Second is a "matcher" like PyHamcrest

The problem that I need to write matcher for some nested properties. So the function will extract nested property and apply a mather to it. But how to do that? PyHamcrest works when object is "here". Of course I can pass nested property as variable but this is not a solution. I need more generic one - define mathcers for nested properties, union all of them with and/or/anyOf` and check.

So for end user: it define nested properties, matcher to apply for them. Then function takes objetc and return true/false wether object mathes or not.

Something shuld work like:

matcher = or(greater_than(exist("porperty.sub_property"), 49), not(exist("porperty.sub_property"))

result = myfunction({"some_obejct": 1}, matcher)

# here result is True

I try my best to exmplain but if it is not clear add a comment.

I need to implement some fucntion that will take 2 arguments:

1. First one contains data. Some class or dict. There is no knoledge what object is - dictionary or class
2. Second is a "matcher" like PyHamcrest

The problem that I need to write matcher for some nested properties. So the function will extract nested property and apply a mather to it. But how to do that? PyHamcrest works when object is "here". Of course I can pass nested property as variable but this is not a solution. I need more generic one - define mathcers for nested properties, union all of them with and/or/anyOf` and check.

So for end user: it define nested properties, matcher to apply for them. Then function takes objetc and return true/false wether object mathes or not.

Something shuld work like:

matcher = or(greater_than(exist("porperty.sub_property"), 49), not(exist("porperty.sub_property"))

result = myfunction({"some_obejct": 1}, matcher)

# here result is True

• python-3.x

1 Answer 1

You need a function that extracts nested properties and applies PyHamcrest matchers dynamically. You can use a recursive approach or operator.attrgetter/dict.get for flexible access.