import json
s = r'["pinnacle","update_markets","PINTN97C6CD59FD7","9122741,0",[["TOTALS__OVER(22.5)",0,"1.806","","{\"key\":\"s;0;ou;22.5\",\"market_name\":\"totals\",\"dest\":\"over\",\"matchup_id\":1436579810,\"league_id\":6869,\"parent_id\":1435648317,\"participant_id\":null,\"is_special\":false}"],["TOTALS__UNDER(22.5)",0,"2.02","","{\"key\":\"s;0;ou;22.5\",\"market_name\":\"totals\",\"dest\":\"under\",\"matchup_id\":1436579810,\"league_id\":6869,\"parent_id\":1435648317,\"participant_id\":null,\"is_special\":false}"]'
data = json.loads(s+']]')
print(data[4][0][0])
print(data[4][0][2])
TOTALS__OVER(22.5)
1.806
Или так:
import json
s = r'["pinnacle","update_markets","PINTN97C6CD59FD7","9122741,0",[["TOTALS__OVER(22.5)",0,"1.806","","{\"key\":\"s;0;ou;22.5\",\"market_name\":\"totals\",\"dest\":\"over\",\"matchup_id\":1436579810,\"league_id\":6869,\"parent_id\":1435648317,\"participant_id\":null,\"is_special\":false}"],["TOTALS__UNDER(22.5)",0,"2.02","","{\"key\":\"s;0;ou;22.5\",\"market_name\":\"totals\",\"dest\":\"under\",\"matchup_id\":1436579810,\"league_id\":6869,\"parent_id\":1435648317,\"participant_id\":null,\"is_special\":false}"]'
data = json.loads(s+']]')
# print(data[4][0][0])
# print(data[4][0][2])
for x in data[4]:
print(x[0] +' - '+ x[2])
TOTALS__OVER(22.5) - 1.806
TOTALS__UNDER(22.5) - 2.02