只要满足某个条件，Python就会暂停执行，如果再次不满足条件，则从它离开的位置继续执行

# 使用while循环计算数字1到10的和
sum = 0
i = 1
while i <= 10:
    sum += i
    i += 1
print("Sum of numbers from 1 to 10 is:", sum)

# 错误的无限循环示例
while True:
    print("This will run forever!")

# 正确的循环示例，设置退出条件
count = 0
while count < 5:
    print("Count is:", count)
    count += 1

# 等待用户输入，最多尝试3次
attempts = 0
while attempts < 3:
    user_input = input("Please enter a number: ")
    if user_input.isdigit():
        print("You entered:", user_input)
        break
    else:
        print("Invalid input, try again.")
        attempts += 1
else:
    print("Too many invalid attempts.")