，说明3是整数类型（Interger）；则告诉我们那个对象是浮点型（Floating point real number）。与id()的结果类似，type()得到的结果也是只读的。
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The difference lies in the fact that floating-point data types used in computers can't hold every real number.
区别在于一个事实：计算机中使用的浮点数据类型无法包含每个实数。
Many of the familiar algebraic rules for real number arithmetic do not always hold for floating-point arithmetic.
对于浮点算法而言，许多惯用的实数算法代数规则有时并不适用。
Floating-Point literals may also be represented using exponential notation: a real number followed by the letter e(or E), followed by an optional plus or minus sign, followed by an integer exponent.
此外，还可以使用指数记数法表示浮点型直接量，即实数后跟随字母e或E，后面加上正负号，其后再加一个整型指数。
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