standard.py 文件源码

def __init__(self, base, config, layered = False, **kwargs):
        addrspace.BaseAddressSpace.__init__(self, base, config, **kwargs)
        self.as_assert(base == None or layered, 'Must be first Address Space')
        self.as_assert(config.LOCATION.startswith("file://"), 'Location is not of file scheme')

        path = urllib.url2pathname(config.LOCATION[7:])
        self.as_assert(os.path.exists(path), 'Filename must be specified and exist')
        self.name = os.path.abspath(path)
        self.fname = self.name
        self.mode = 'rb'
        if config.WRITE:
            self.mode += '+'
        self.fhandle = open(self.fname, self.mode)
        self.fhandle.seek(0, 2)
        self.fsize = self.fhandle.tell()

    # Abstract Classes cannot register options, and since this checks config.WRITE in __init__, we define the option here