
请问这个怎么写
sum = 0
while True:
a = input("Please enter a number (enter letter a to stop): ")
if a == 'a':
break;
sum += int(a)
print(f"The sum of all the numbers is: {sum}.")
# Output
Please enter a number (enter letter a to stop): 1
Please enter a number (enter letter a to stop): 2
Please enter a number (enter letter a to stop): 3
Please enter a number (enter letter a to stop): 4
Please enter a number (enter letter a to stop): 5
Please enter a number (enter letter a to stop): 6
Please enter a number (enter letter a to stop): 7
Please enter a number (enter letter a to stop): 8
Please enter a number (enter letter a to stop): 9
Please enter a number (enter letter a to stop): 10
Please enter a number (enter letter a to stop): a
The sum of all the numbers is: 55.