python函数中文手册.doc

内置函数
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二,函数列表
1,取绝对值
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 plex number, its magnitude is returned.
如果你不知道绝对值什么意思,那就要补一下小学数学了!
基本用法
2,
all(iterable)
Return True if all elements of the iterable are true (or if the iterable is empty). Equivalent to:
3.
any(iterable)
Return True if any element of the iterable is true. If the iterable is empty, return False. Equivalent to:
4.
basestring()
This abstract type is the superclass for str and unicode. It cannot be called or instantiated, but it can be used to test whether an object is an instance of str or unicode. isinstance(obj, basestring) is equivalent to isinstance(obj, (str, unicode)).
是字符串和字符编码的超类,是抽象类型。不能被调用或者实例化。可以用来判断实例是否为字符串或者字符编码。
方法:

bin(x)
Convert an integer number to a binary string. The result is a valid Python expression. If x is not a Python int object, it has to define an __index__() method that returns an integer.
转换成二进制表达
方法:

bool([x])
Convert a value to a Boolean, using the standard truth testing procedure. If x is false or omitted, this returns False; otherwise it returns True. bool is also a class, which is a subclass of int. Class bool cannot be subclassed further. Its only instances are False and True
布尔类型的转化
用法:
7. 二进制数组的转化
bytearray([source[, encoding[, errors]]])
Return a new array of bytes. The bytearray type is a mutable sequence of integers in the range 0 <= x < 256. It has most of the usual methods of mutable sequences, described in Mutable Sequence Types, as well as most methods that the str type has, see String Methods.
The optional source parameter can be used to initialize the array in a few different ways:
If it is a string, you must also give the encoding (and optionally, errors) parameters; bytearray() then converts the string to bytes using ()