关于Python：Python – 用户输入数据类型

Python - User input data type

我在Python 3.x中编写了以下代码来验证用户的输入：

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while True:
try:
answer = int(input("Enter an integer:"))
except ValueError:
print("That's not a whole number. Try again.")

我知道输入'hi'或'hi46'将是字符串(并且会导致ValueError)。

什么数据类型输入''(无)是什么？输入']％$'(符号)怎么样？

假设您正在使用python 3.X，用户输入的所有内容都将是一个字符串。甚至数字看上去像"23"或"0"。 int(thing)不验证thing是整数类型。它试图将thing从现在的任何类型转换为整数类型，如果不可能则引发ValueError。

示范：

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>>> while True:
... x = input("Enter something:")
... print("You entered {}".format(x))
... print("That object's type is: {}".format(type(x)))
...
Enter something: hi
You entered hi
That object's type is: <class 'str'>
Enter something: hi46
You entered hi46
That object's type is: <class 'str'>
Enter something:
You entered
That object's type is: <class 'str'>
Enter something: ]%$
You entered ]%$
That object's type is: <class 'str'>
Enter something: 23
You entered 23
That object's type is: <class 'str'>
Enter something: 42
You entered 42
That object's type is: <class 'str'>
Enter something: 0
You entered 0
That object's type is: <class 'str'>