我该怎么做，当我输入 chairsale < 0 时，如果我只想让它循环到椅子输入直到它不低于 0，它不会循环回桌面输入

您可以通过使用嵌套循环反复请求椅子销售来实现此目的，直到输入正数。下面介绍了如何修改代码以实现此目的：

    # Initialize variables for total sales and total commissions
total_table_sales = 0
total_desk_sales = 0
total_chair_sales = 0
total_table_commission = 0
total_desk_commission = 0
total_chair_commission = 0

# Outer loop for entering salesperson data
while True:
    saleperson = int(input("Please input salesperson ID or -1 to end: "))
    if saleperson == -1:
        break

    desksale = int(input("Enter desk sales: "))
    if desksale < 0:
        print("Invalid desk sales please enter a positive number")
        continue

    tablesale = int(input("Enter table sales: "))
    if tablesale < 0:
        print("Invalid table sales please enter a positive number")
        continue

    # Inner loop for chair sales
    while True:
        chairsale = int(input("Enter chair sales: "))
        if chairsale < 0:
            print("Invalid chair sales please enter a positive number")
        else:
            break

    # Calculate commissions for each type of sale
    table_commission = tablesale * 0.1
    desk_commission = desksale * 0.15
    chair_commission = chairsale * 0.05

    # Update total sales and total commissions
    total_table_sales += tablesale
    total_desk_sales += desksale
    total_chair_sales += chairsale
    total_table_commission += table_commission
    total_desk_commission += desk_commission
    total_chair_commission += chair_commission

# Display the sales and commission tables
print("Sales Table:")
print("Salesperson ID | Table Sales | Desk Sales | Chair Sales")
print(f"{saleperson} | {tablesale} | {desksale} | {chairsale}")
print("Total | {} | {} | {}".format(total_table_sales, total_desk_sales, total_chair_sales))

print("Commission Table:")
print("Salesperson ID | Table Commission | Desk Commission | Chair Commission")
print(f"{saleperson} | {table_commission} | {desk_commission} | {chair_commission}")
print("Total | {} | {} | {}".format(total_table_commission, total_desk_commission, total_chair_commission))

此代码将继续要求椅子销售，直到输入正数，并且它将正确计算总销售额和佣金。

您需要有多个 while 循环来检查条件，因为您需要检查每个输入是否都是有效数字并检查它们，直到用户输入有效输入。我已经根据您发布的评分标准调整了代码。

saleperson = int(input("Please input salesperson ID or -1 to end: "))
while saleperson != -1:
    desksale = int(input("Enter desk sales: "))
    while desksale < 0:
        desksale = int(input("Invalid desk sales please enter a positive number:"))

    tablesale = int(input("Enter table sales: "))
    while tablesale < 0:
        tablesale = int(input("Invalid table sales please enter a positive number:"))
    chairsale = int(input("Enter chair sales: "))
    while chairsale < 0:
        chairsale = int(input("Invalid chair sale please enter a positive number:"))
    saleperson = int(input("Please input salesperson ID or -1 to end: "))

在这里，我确保所有待售输入都不是负数，当用户进入程序时，程序将立即停止。-1saleperson

仅当用户仅输入整数时，这才有效。应尝试验证输入是否为数字，并且在用户输入字符串时不会遇到错误。

当您键入 -1 时，您的代码返回请求 desksale 的原因是该语句的计算结果为 True，导致您的程序执行，然后返回到 while 循环的开头，因为 saleperson 仍然< 0。if tablesale < 0 print("Invalid table sales please enter a positive number")

不要使用 saleperson 变量作为 while 循环的条件，而是尝试使用 Boolean 标志，您可以根据其他变量赋值切换到 True 或 False，或者只使用 .尽管这是一种不鼓励的方法，但只要您小心放置语句以防止无限循环，它就可以完成工作。while Truebreak

在获得预期的答案之前，我也不建议您将用户锁定在问题中。这是一种更好的方法，向用户抛出一个解释性错误，然后从头开始所有提示。像这样的东西：

while True:

    saleperson = int(input("Please input salesperson ID or -1 to end: "))
    if saleperson == -1:
        break # Here’s your exit
   
    desksale = int(input("Enter desk sales: "))
    if desksale < 0:
        print("Invalid desk sales! Please enter a positive number or 0")
        continue # Restart the loop
    
    tablesale = int(input("Enter table sales: "))
    if tablesale < 0:
        print("Invalid table sales! Please enter a positive number or 0")
        continue # Restart the loop
       
    chairsale = int(input("Enter chair sales: "))
    if chairsale < 0:
        print("Invalid chair sales! Please enter a positive number or 0”)
        # No need to restart the loop as it will automatically restart because there is no more code to execute