test.out

--------------------------
Document (before): {}
Patch:             [{"path": "/domains", "value": [{"domain": "addDomainList.com", "protocol": "http"}], "op": "add"}]
Document (after):  {"domains": [{"domain": "addDomainList.com", "protocol": "http"}]}
--------------------------
Document (before): {"domains": []}
Patch:             [{"path": "/domains", "value": [{"domain": "addDomainList.com", "protocol": "http"}], "op": "add"}]
Document (after):  {"domains": [{"domain": "addDomainList.com", "protocol": "http"}]}
--------------------------
Document (before): {"domains": [{"domain": "existingDomain.com"}]}
Patch:             [{"path": "/domains", "value": [{"domain": "addDomainList.com", "protocol": "http"}], "op": "add"}]
Document (after):  {"domains": [{"domain": "addDomainList.com", "protocol": "http"}]}
--------------------------
Document (before): {}
Patch:             [{"path": "/domains", "value": [{"domain": "addDomainList.com", "protocol": "http"}], "op": "replace"}]
ERROR!!! can't replace non-existent object 'domains'
--------------------------
Document (before): {"domains": []}
Patch:             [{"path": "/domains", "value": [{"domain": "addDomainList.com", "protocol": "http"}], "op": "replace"}]
Document (after):  {"domains": [{"domain": "addDomainList.com", "protocol": "http"}]}
--------------------------
Document (before): {"domains": [{"domain": "existingDomain.com"}]}
Patch:             [{"path": "/domains", "value": [{"domain": "addDomainList.com", "protocol": "http"}], "op": "replace"}]
Document (after):  {"domains": [{"domain": "addDomainList.com", "protocol": "http"}]}
--------------------------
Document (before): {}
Patch:             [{"path": "/domains", "op": "remove"}]
ERROR!!! can't remove non-existent object 'domains'
--------------------------
Document (before): {"domains": []}
Patch:             [{"path": "/domains", "op": "remove"}]
Document (after):  {}
--------------------------
Document (before): {"domains": [{"domain": "existingDomain.com"}]}
Patch:             [{"path": "/domains", "op": "remove"}]
Document (after):  {}

test.py

from jsonpatch import JsonPatch, JsonPatchConflict
import json

def print_test(patch, doc):

    patch = JsonPatch(patch)
    try:

        print "--------------------------"
        print "Document (before): " + json.dumps(doc)
        print "Patch:             " + patch.to_string()

        result = patch.apply(doc)
        print "Document (after):  " + json.dumps(result)
    except JsonPatchConflict as e:
        print "ERROR!!! " + str(e)

print_test([
    {
        "op": "add",
        "path": "/domains",
        "value": [
            {
                "domain": "addDomainList.com",
                "protocol": "http"
            }
        ]
    }
], {})

print_test([
    {
        "op": "add",
        "path": "/domains",
        "value": [
            {
                "domain": "addDomainList.com",
                "protocol": "http"
            }
        ]
    }
], {
    "domains": []
})

print_test([
    {
        "op": "add",
        "path": "/domains",
        "value": [
            {
                "domain": "addDomainList.com",
                "protocol": "http"
            }
        ]
    }
], {
    "domains": [
        {
            "domain": "existingDomain.com"
        }
     ]
})

print_test([
    {
        "op": "replace",
        "path": "/domains",
        "value": [
            {
                "domain": "addDomainList.com",
                "protocol": "http"
            }
        ]
    }
], {})

print_test([
    {
        "op": "replace",
        "path": "/domains",
        "value": [
            {
                "domain": "addDomainList.com",
                "protocol": "http"
            }
        ]
    }
], {
    "domains": []
})

print_test([
    {
        "op": "replace",
        "path": "/domains",
        "value": [
            {
                "domain": "addDomainList.com",
                "protocol": "http"
            }
        ]
    }
], {
    "domains": [
        {
            "domain": "existingDomain.com"
        }
     ]
})

print_test([
    {
        "op": "remove",
        "path": "/domains"
    }
], {})

print_test([
    {
        "op": "remove",
        "path": "/domains"
    }
], {
    "domains": []
})

print_test([
    {
        "op": "remove",
        "path": "/domains"
    }
], {
    "domains": [
        {
            "domain": "existingDomain.com"
        }
     ]
})