python3之print()函数

1、函数：
def print(self, *args, sep=' ', end='
', file=None): # known special case of print
    """
    print(value, ..., sep=' ', end='
', file=sys.stdout, flush=False)
    
    Prints the values to a stream, or to sys.stdout by default.
    Optional keyword arguments:
    file:  a file-like object (stream); defaults to the current sys.stdout.#写入到文件中
    sep:   string inserted between values, default a space.
    end:   string appended after the last value, default a newline.
    flush: whether to forcibly flush the stream.
    """
2、file参数应用：
　　with open('filename','w') as f：#必须要有写权限
　　　　print('123'，file=f)#把123写入到filename文件中
3、格式化输出：
   print('%d+%d=%d' % (x,y,z))