Currently qualifiers are misidentified as references when fromJSON() is called on the parent claim.
To test:
$ python pwb.py shell Welcome to the Pywikibot interactive shell! >>> repo = pywikibot.Site('wikidata', 'wikidata').data_repository() >>> item = pywikibot.ItemPage(repo, 'Q4115189') >>> item.exists() True >>> c = item.claims['P800'][0] >>> sc = c.sources[1]['P813'][0] >>> qc = c.qualifiers['P580'][0] >>> qc.isReference True >>> qc.isQualifier False >>> sc.isReference True >>> sc.isQualifier False
https://www.wikidata.org/w/api.php?action=wbgetentities&ids=Q4115189 contains
...
"P800": [
{
"mainsnak": {
"snaktype": "value",
"property": "P800",
"datavalue": {
"value": {
"entity-type": "item",
"numeric-id": 4115189
},
"type": "wikibase-entityid"
},
"datatype": "wikibase-item"
},
"type": "statement",
"qualifiers": {
"P580": [
{
"snaktype": "value",
"property": "P580",
"hash": "a1e9eb581e4e1ce68f837f4e7f2751373180abd8",
"datavalue": {
"value": {
"time": "+1901-02-03T00:00:00Z",
"timezone": 0,
"before": 0,
"after": 0,
"precision": 11,
"calendarmodel": "http://www.wikidata.org/entity/Q1985727"
},
"type": "time"
},
"datatype": "time"
}
]
},
"qualifiers-order": [
"P580"
],
"id": "Q4115189$e3d28f24-4982-a547-985d-136e972fd58a",
"rank": "normal",
"references": [
{
"hash": "7ad766a38be5f2a6af31d4dffea0ba491be0e0bf",
"snaks": {
"P50": [
{
"snaktype": "value",
"property": "P50",
"datavalue": {
"value": {
"entity-type": "item",
"numeric-id": 14411
},
"type": "wikibase-entityid"
},
"datatype": "wikibase-item"
}
]
},
"snaks-order": [
"P50"
]
},
{
"hash": "f172f7e0b94254fcdaaf9027714322a06e9872a8",
"snaks": {
"P813": [
{
"snaktype": "value",
"property": "P813",
"datavalue": {
"value": {
"time": "+2014-11-29T00:00:00Z",
"timezone": 0,
"before": 0,
"after": 0,
"precision": 11,
"calendarmodel": "http://www.wikidata.org/entity/Q1985727"
},
"type": "time"
},
"datatype": "time"
}
],
"P854": [
{
"snaktype": "value",
"property": "P854",
"datavalue": {
"value": "https://www.wikidata.org/wiki/Q4115189",
"type": "string"
},
"datatype": "url"
}
]
},
"snaks-order": [
"P813",
"P854"
]
}
]
}
],
...There we can see hash in both qualifiers and references, however the hash is at a different 'level' in the JSON.
I have a quick patch which simply moves the isQualifier/isReference assignment to the qualifierFromJSON()/referenceFromJSON() methods. However since I'm unsure if fromJSON() is ever called directly on a qualifer/reference I'm not sure whether this is enough.