[Python] Thread Safety in Python's dictionary

I have a class which holds a dictionary

class OrderBook:
orders = {'Restaurant1': None,
'Restaurant2': None,
'Restaurant3': None,
'Restaurant4': None}

@staticmethod
def addOrder(restaurant_name, orders):
OrderBook.orders[restaurant_name] = orders


And I am running 4 threads (one for each restaurant) that call the method OrderBook.addOrder. Here is the function ran by each thread:

def addOrders(restaurant_name):

#creates orders
...

OrderBook.addOrder(restaurant_name, orders)


Is this safe, or do I have to use a lock before calling addOrder?

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