[Python] How to stop this while loop after it has run through a full array

I have this code that runs a loop, and it functions almost exactly how I want, except that I cannot get it to stop. Below is the relevant code:

while(True):
try:
# File to persist counter
COUNTER_FILE = 'run_counter.txt'

def get_next_element(arr):
"""Get next array element using persisted counter"""

# Read existing counter or initialize
if os.path.exists(COUNTER_FILE):
with open(COUNTER_FILE, 'r') as f:
counter = int(f.read().strip())
else:
counter = 0

# Get current element
element = arr[counter % len(arr)] # Use modulo for circular behavior

# Update counter
counter += 1
with open(COUNTER_FILE, 'w') as f:
f.write(str(counter))

return element

# Example usage across multiple runs
city_array = ['1', '2', '3']
city = get_next_element(city_array)
print(f"Assigned value: {city}")

<---- Some Code below that runs Selenium, works fine ---->


I understand that this sequence repeats on a forever loop because of while(True). I'm not sure what to change that loop to. I've also tried the simple solution:

print(f"Assigned value: {city}")
break


If I use the break in the above snippet, the counter will stop at the first element in this array:

city_array = ['1', '2', '3']

• 
  What is happening: It runs the full city_array ['1', '2', '3'], or [0, 1, 2], then it runs it again, infinitely.
  
  
• 
  What I want to happen: It runs the full city_array ['1', '2', '3'], or [0, 1, 2] -- then I want it to stop once it has run through the full array.
  

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