Python:如果变量是整数或 float 则为真

我正在尝试根据书本作业编写一个小程序，但我无法检测用户的输入是 int/float(对总数的增量)还是 string (返回错误)。我尝试在 add_to_total 变量上使用 .isdigit() 但是当我输入一个 float 时，它会直接跳到 else 代码块。我曾尝试在互联网上搜索，但找不到明确的答案。这是我的代码:

total = 0 
print("Welcome to the receipt program!") 
 
while True: 
    add_to_total = raw_input("Enter the value for the seat ['q' to quit]: ") 
    if add_to_total == 'q': 
        print("*****") 
        print "Total: $%s" % total 
        break 
    if add_to_total.isdigit(): #Don't know how to detect if variable is int or float at the same time. 
        add_to_total = float(add_to_total) 
        total += add_to_total 
    else: 
        print "I'm sorry, but '%s' isn't valid. Please try again." % add_to_total 

如有任何答复，我们将不胜感激。

请您参考如下方法:

您始终可以使用try...except 方法:

try: 
    add_to_total = float(add_to_total) 
except ValueError: 
    print "I'm sorry, but '%s' isn't valid. Please try again." % add_to_total 
else: 
    total += add_to_total 

记住:it's easier to ask forgiveness than permission