如何檢查Python中的整數輸入？

Question

我用了：

day = int(input('Please input the day you were born: e.g 8th=8 21st = 21 : '))
month = int(input('Please input the month you were born: e.g may = 5 december = 12 : '))
year = int(input('Please input the year you were born: e.g 2001 / 1961 : '))

if day == int and month == int and year == int:

但它總是即使它是一個整數說它是錯的。

Answer 1

def get_int(p,error_msg="Thats Not An Int!"):
    while True:
         try:
            return int(raw_input(p))
         except (ValueError,TypeError):
            print "ERROR: %s"%error_msg

day = get_int('Please input the day you were born: e.g 8th=8 21st = 21 : ')
#day is guaranteed to be an int

我喜歡這個並進一步抽象它

 def force_type(type_class,prompt,error_msg):
     while True:
         try:
            return type_class(prompt)
         except (ValueError,TypeError):
            print error_msg

然后就變成了

 def get_int(p,err_msg):
     return force_type(int,p,err_msg)
 def get_float(p,err_msg):
     return force_type(float,p,err_msg)
 ...

總而言之，如果你想進行type(var)你應該〜 不 〜使用type(var)你應該使用isinstance(var,int)

Answer 2

要檢查類型，您可以：

type(aVar) is aType

無論如何，正如凱文在評論中所說，你已經將輸入包裝到int中，所以它實際上是一個int或你的程序崩潰了

Answer 3

嘗試

if type(day) == int and type(month) == int and type(year) == int