python内置函数1-abs()
Help on built-in function abs in module __builtin__:abs(...)
abs(number) -> number
Return the absolute value of the argument.
abs(x)
Return the absolute value of a number. The argument may be a plain or long integer or a floating point number. If the argument is a complex number, its magnitude is returned.
说明：
[*] 返回数字的绝对值，参数可以是整数、浮点数或者复数
2. 如果参数是一个复数，此方法返回此复数的绝对值（此复数与它的共轭复数的乘积的平方根）
>>> abs(5)
5
>>> abs(-3)
3
>>> abs(0)
0
>>> abs(7.1415)
7.1415
>>> abs(-7.1415)
7.1415
>>> a=complex(3,4)
>>> a
(3+4j)
>>> abs(a)
5.0
>>> b=complex(-2,-8)
>>> b
(-2-8j)
>>> abs(b)
8.246211251235321
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