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import os



class FileWrapper(file):

    def __init__(self, *args, **kwargs):

        file.__init__(self, *args, **kwargs)

        self.force_size = getattr(self, 'force_size', False)



        self.initial_read_pos = self.tell()

        self.file_size = os.path.getsize(self.name)



    def read(self, size=-1):

        if self.force_size:

            size = self.force_size

        data = file.read(self, size)



        if not data or size < 0 or size >= self.file_size:

            self.seek(self.initial_read_pos)

        return data



if __name__ == '__main__':

    print "File Exists at start:", os.path.exists("thing.txt")

    fd1 = FakeFile("thing.txt", "w")

    fd1.write("Hello World!")

    fd1.close()



    print "File Exists after write:", os.path.exists("thing.txt")



    fd2 = FakeFile("thing.txt", "r")

    data = fd2.read()

    fd2.close()



    print "data read:", data



    fd3 = FakeFile("thing.txt", "r")

    data_single = fd3.read(1)

    while data_single:

        print "data read:", data_single

        data_single = fd3.read(1)



    data_beyond = fd3.read()

    print "After EOF:", data_beyond



    data_too_much = fd3.read(100)



    print "Too much?", data_too_much



    data_five = fd3.read(5)



    print "First Five:", data_five



    data_end = fd3.read()



    print "End of file:", data_end

    fd3.close()



    os.remove("thing.txt")