Python: True if variable is integer or float

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I am trying to write a small program from a book assignment, but I am having trouble with detecting if the user's input is a int/float (increment to the total) or string (return error). I tried using .isdigit() on the add_to_total variable but when I type in a float, it skips straight to the else code block. I have tried searching on the internet but can't find a clear answer. Here is my code: 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

Any answer would be greatly appreciated.

asked 32 secs ago

Thomas Yao

54