为什么我的显示代码def show_products(): print("请选择显示方式：") print("1. 根据销售价格显示") print("2. 根据销售数量显示") print("3. 根据利润显示") option = input("请选择：") print("请选择排序方式：") print("1. 升序排列") print("2. 降序排列") order = "asc" if input("请选择：") == "1" else "desc" with open("products.csv", "r") as file: reader = csv.reader(file) header = next(reader) rows = [row for row in reader] if option == "1": rows.sort(key=lambda x: float(x[1]), reverse=order == "desc") elif option == "2": rows.sort(key=lambda x: int(x[4]), reverse=order == "desc") else: rows.sort(key=lambda x: float(x[1]) - float(x[2]), reverse=order == "desc") print("{:<10}{:<10}{:<10}{:<10}{:<10}".format(*header)) for row in rows: print("{:<10}{:<10}{:<10}{:<10}{:<10}".format(*row))出现了这样子的问题Traceback (most recent call last): File "D:/pythonProject1/main.py", line 208, in <module> main() File "D:/pythonProject1/main.py", line 194, in main show_products() File "D:/pythonProject1/main.py", line 61, in show_products rows.sort(key=lambda x: float(x[1]), reverse=order == "desc") File "D:/pythonProject1/main.py", line 61, in <lambda> rows.sort(key=lambda x: float(x[1]), reverse=order == "desc") ValueError: could not convert string to float: '销售价' 进程已结束,退出代码1请告诉我如何解决这个问题

这个问题的错误是 "could not convert string to float: '销售价'"，意思是无法将字符串 "销售价" 转换为浮点数。这是因为在排序前，代码尝试将第二列 "销售价" 转换为浮点数。但是，这一列的第一个单元格实际上是标题，而不是数字。

解决方法是在代码中添加一个判断，跳过第一个行。例如，在读取 CSV 文件的循环中添加检查行号是否为 0，如果是，则跳过该行。这样，程序就不会将标题行作为数据行处理，就不会出现无法转换为浮点数的错误。

修改后的代码如下所示：

def show_products():
    print("请选择显示方式：")
    print("1. 根据销售价格显示")
    print("2. 根据销售数量显示")
    print("3. 根据利润显示")
    option = input("请选择：")
    print("请选择排序方式：")
    print("1. 升序排列")
    print("2. 降序排列")
    order = "asc" if input("请选择：") == "1" else "desc"
    with open("products.csv", "r") as file:
        reader = csv.reader(file)
        header = next(reader)
        rows = []
        for row in reader:
            if reader.line_num == 1:
                continue
            rows.append(row)
    if option == "1":
        rows.sort(key=lambda x: float(x[1]), reverse=order == "desc")
    elif option == "2":
        rows.sort(key=lambda x: int(x[4]), reverse=order == "desc")
    else:
        rows.sort(key=lambda x: float(x[1]) - float(x[2]), reverse=order == "desc")
    print("{:<10}{:<10}{:<10}{:<10}{:<10}".format(*header))
    for row in rows:
        print("{:<10}{:<10}{:<10}{:<10}{:<10}".format(*row))

希望这能帮助你解决问题！