什么函数允许询问变量是否是if语句中的整数

时间:2014-09-28 16:20:44

标签: python string integer

user_input = int(input("Please enter a multiplier!"))
if user_input == int:
    for multiplier in range (1,12,1): #this is where i'm kinda stuck
        print multiplier, " x ", user_input, " = ", multiplier * user_input
elif user_input == str:
        print "Please enter a quantitative numerical value as a multiplier, and try again, thanks!"

这就是我在做的事情:     user_input = float(输入("请输入乘数!"))     乘以范围(1,13,1):             打印乘数," x",user_input," =",乘数* user_input

这是输出     1 x 9.9 = 9.9     2 x 9.9 = 19.8     3 x 9.9 = 29.7     4 x 9.9 = 39.6     5 x 9.9 = 49.5     6 x 9.9 = 59.4     7 x 9.9 = 69.3     8 x 9.9 = 79.2     9 x 9.9 = 89.1     10 x 9.9 = 99.0     11 x 9.9 = 108.9     12 x 9.9 = 118.8

#Yet if the user inputs a string (a letter) how should I convert it?

1 个答案:

答案 0 :(得分:0)

您可以使用typeinsinstance模块的builtin执行此操作,例如,

if type(user_input) is int:
    # your code

type返回obect的类型。或者使用insinstance

if isinstance(user_input, int):
    # your code
如果对象是类的实例或它的子类,则

isinstance返回True

现在,在您的代码中,您已经在第一行中投射了user_inputint。因此,无需检查user_inputint还是str。如果您输入的数字不是数字,程序也会引发错误。