Если вам нужна только левая строка для каждой пары:
import json
s = '{'+ '''"PlayerId":169193,"PlayerName":"Alexandre Lacazette","PlaysOnHomeTeam":true,"OptaId":"p59966","GoalsConcededInBox":1,"ShotsInsideBox":8,"ShotsWoodwork":1,"TotalPasses":31,"PassSuccess":23,"KeyPasses":5,"DribblesAttempted":3,"DribblesWon":2,"AerialsWon":5,"AerialsLost":2,"TacklesSuccess":3,"TacklesAttempted":3''' + '}'
list(json.loads(s))
Выход:
['PlayerId', 'PlayerName', 'PlaysOnHomeTeam', 'OptaId', 'GoalsConcededInBox', 'ShotsInsideBox', 'ShotsWoodwork', 'TotalPasses', 'PassSuccess', 'KeyPasses', 'DribblesAttempted', 'DribblesWon', 'AerialsWon', 'AerialsLost', 'TacklesSuccess', 'TacklesAttempted']