JSON Example | Python Fiddle

import json

# Hilfsfunktion, Liste und Suchtitel als Argumente
def title_to_id(search_list, title):
    for item in search_list:
        if item["title"] == title:
            return item["id"]

# Beispiel JSON, als String:
json_str="""
{
	"items": [{
		"id": "Y2lzY29zcGFyazovL3VzL1JPT00vODllYzJlODItNGU5Ni0zYWJkLTgzMTktNGE4YjNiY2VlOWIx",
		"title": "Oliver Olmesdahl (oolmesda)",
		"type": "direct",
		"isLocked": false,
		"lastActivity": "2016-04-12T11:10:44.063Z",
		"created": "2016-04-12T11:10:13.713Z"
	}, {
		"id": "Y2lzY29zcGFyazovL3VzL1JPT00vMzExMGViYWUtY2NjNi0zM2ViLWIyZjYtMmY0ZDA5YTIyODBl",
		"title": "Reto Kolb (rkolb)",
		"type": "direct",
		"isLocked": false,
		"lastActivity": "2016-04-11T16:19:06.413Z",
		"created": "2016-04-11T16:18:58.122Z"
	}]
}
"""

# JSON in Dictionary laden:
items_dict = json.loads(json_str)

# Hinter Key "items" steckt eine Liste:
items_list = items_dict["items"]

# Tests:
id = title_to_id(items_list, "titelgibtsgarnicht")
print id # Should be None
id = title_to_id(items_list, "Oliver Olmesdahl (oolmesda)")
print id # Should be correct id

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