How use wikidata api to access to the statements - json

Question

I'm trying to get information from Wikidata. For example, to access to "cobalt-70" I use the API.
API_ENDPOINT = "https://www.wikidata.org/w/api.php"
query = "cobalt-70"
params = {
'action': 'wbsearchentities',
'format': 'json',
'language': 'en',
'search': query
}
r = requests.get(API_ENDPOINT, params = params)
print(r.json())
So there is a "claims" which gives access to the statements. Is there a best way to check if a value exists in the statement? For example, "cobalt-70" have the value 0.5 inside the property P2114. So how can I check if a value exists in the statement of the entity? As this example.
Is there an approach to access it. Thank you!

Answer 1

I'm not sure this is exactly what you are looking for, but if it's close enough, you can probably modify it as necessary:
import requests
import json
url = 'https://www.wikidata.org/wiki/Special:EntityData/Q18844865.json'
req = requests.get(url)
targets = j_dat['entities']['Q18844865']['claims']['P2114']
for target in targets:
values = target['mainsnak']['datavalue']['value'].items()
for value in values:
print(value[0],value[1])
Output:
amount +0.5
unit http://www.wikidata.org/entity/Q11574
upperBound +0.6799999999999999
lowerBound +0.32
amount +108.0
unit http://www.wikidata.org/entity/Q723733
upperBound +115.0
lowerBound +101.0
EDIT:
To find property id by value, try:
targets = j_dat['entities']['Q18844865']['claims'].items()
for target in targets:
line = target[1][0]['mainsnak']['datavalue']['value']
if isinstance(line,dict):
for v in line.values():
if v == "+0.5":
print('property: ',target[0])
Output:
property: P2114

Answer 2

I try a solution which consists to search inside the json object as the solution proposed here : https://stackoverflow.com/a/55549654/8374738. I hope it can help. Let's give you the idea.
import pprint
def search(d, search_pattern, prev_datapoint_path=''):
output = []
current_datapoint = d
current_datapoint_path = prev_datapoint_path
if type(current_datapoint) is dict:
for dkey in current_datapoint:
if search_pattern in str(dkey):
c = current_datapoint_path
c+="['"+dkey+"']"
output.append(c)
c = current_datapoint_path
c+="['"+dkey+"']"
for i in search(current_datapoint[dkey], search_pattern, c):
output.append(i)
elif type(current_datapoint) is list:
for i in range(0, len(current_datapoint)):
if search_pattern in str(i):
c = current_datapoint_path
c += "[" + str(i) + "]"
output.append(i)
c = current_datapoint_path
c+="["+ str(i) +"]"
for i in search(current_datapoint[i], search_pattern, c):
output.append(i)
elif search_pattern in str(current_datapoint):
c = current_datapoint_path
output.append(c)
output = filter(None, output)
return list(output)
And you just need to use:
pprint.pprint(search(res.json(),'0.5','res.json()'))
Output:
["res.json()['claims']['P2114'][0]['mainsnak']['datavalue']['value']['amount']"]