Python模拟C++输出流

看到一Python例子，挺有意思的，用Python模拟C++的输出流OStream.单纯只是玩。

原理: 利用Python __lshift__左移内建函数<<，调用时将输出内容，如果内容为回车，则处理回车。

看例子^_^!!!

#coding: utf-8

class IOManipulator(object):
    def __init__(self, function=None):
        self.function = function

    def do(self, output):
        self.function(output)

# 处理回车
def do_endle(stream):
    stream.output.write('
')
    stream.output.flush()

endl = IOManipulator(do_endle)


class OStream(object):
    def __init__(self, output=None):
        if output is None:
            import sys
            output = sys.stdout
            self.output = output
            self.format = '%s'

    def __lshift__(self, thing):
        if isinstance(thing, IOManipulator):
            thing.do(self)
        else:
            self.output.write(self.format % thing)
            self.format = '%s'
        return self
        

def main():
    cout = OStream()
    cout << "abc" << 1 << "ddddd" << endl

if __name__ == '__main__':
    main()