从你写的东西和代码中的注解来看，我猜你希望程序继续运行，如果你输入了一个非正数，我会把它重写为：

print("Welcome to the number program")
total_number = 0
entries = 0

while True:
    number = input("Please give me a number \n")
    number = int(number)

    if number == -999:
        break

    if number <= 0:
        print("Sorry, this value needs to be positive. Please enter a different number.")
        continue

    total_number = total_number + number
    entries += 1
    print(total_number)

print(total_number)
print(entries)
print(total_number / entries)

此外，还可以使用entries += 1递增数字

1.在大多数情况下，您不应该先创建变量，但在这种情况下，您应该先创建number = 0、tally = 0和total_number = 0
1.接受while循环中的第一个数字，并处理其中的所有逻辑。

1. while循环应该继续循环，直到满足最后一个条件（似乎是number == -999
   1.如果您输入一个负数，理货应该增加吗？我认为不应该。那么0呢？将tally的增量和total_number的加法包含在if number > -1:条件中。使用if else检查number == -999，使用else处理无效条目。
   1.最后，把print语句移出while循环，它也不需要一个条件，因为现在，如果你退出while循环，这个条件就已经满足了。
   最后一点，这只是一个很好的了解/拥有和纯粹的语法糖，大多数语言支持缩写增量。有一个更好的词来形容它，但要点很简单。

total_number += number
# is exactly the same as 
total_number = total_number + number
# but way nicer to read and write :)

print("Welcome to the number program")
    number = 0
    total_number = 0
    entries = 0

    while number != -999:
        number = input("Please enter a number! \n")

        number = int(number)

        if number >= 0
            total_number += number
            entries += 1
            print("Current sum: " + total_number)
        elif number == -999:
            break
        else
            print("Sorry, this value needs to be positive.")

    
    print("Sum of entries: "+str(total_number))
    print("Number of entries: " + str(entries))
    print("Average entry: " +str(total_number/entries))

我已经重写了你的代码。但是我不确定目标是什么。不管怎样，如果值小于0，循环就会退出，新的值也不会从输入中被接受。还有一些东西我写得更优雅了。

print("Welcome to the number program")
number=int(input("Please give me a number \n"))
total_number=0
entries=0

while number > 0:
    total_number += number
    print(total_number)
    number = int(input("Please give me another number! \n"))
    entries += 1
    if number == -999:
        print(total_number)
        print(entries)
        print(total_number/entries)
        break
    elif number < 0:
        number = input("Sorry, this value needs to be positive. Please enter a different number!")