为什么我的代码不显示竞争条件？

Question

此代码不应该总是有效，但它在我的机器上有效！

from datetime import datetime
import threading

# Create a shared resource
shared_resource = 0

# Create a lock
# lock = threading.Lock()

# Define a function that will access the shared resource
def update_shared_resource():
    global shared_resource
    for i in range(10000000):
        # Acquire the lock
        # lock.acquire()
        shared_resource += 1
        # Release the lock
        # lock.release()

# Create two threads to run the function concurrently
thread1 = threading.Thread(target=update_shared_resource)
thread2 = threading.Thread(target=update_shared_resource)

# Start the threads
thread1.start()
thread2.start()

# Wait for the threads to finish
thread1.join()
thread2.join()

# Print the final value of the shared resource
print(str(datetime.now()) + " Shared resource value: ", shared_resource)

由于竞争条件，多次运行这段代码应该会产生随机结果，但在我的机器上，它每次总是给出正确的结果！ （我在其他机器和在线编译器上试过，有的按预期工作，有的和我的机器一样！） 编译器是否在幕后做了一些事情？我的机器是不是很快！？！！